H-3979: Expose a convert token in query paths

[TimDiekmann]

🌟 What is the purpose of this PR?

It does not add any type safety as we have string in the list of possible tokens, however, having "convert" in the list of tokens will make DX easier.

[github-actions]

Benchmark results

@rust/hash-graph-benches – Integrations

scaling_read_entity_complete_zero_depth

Function	Value	Mean	Flame graphs
entity_by_id	25 entities	$$3.40 \mathrm{ms} \pm 10.8 \mathrm{μs}\left({\color{gray}0.066 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	1 entities	$$2.01 \mathrm{ms} \pm 7.05 \mathrm{μs}\left({\color{gray}-0.300 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	5 entities	$$2.03 \mathrm{ms} \pm 14.4 \mathrm{μs}\left({\color{gray}0.262 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	10 entities	$$2.13 \mathrm{ms} \pm 12.1 \mathrm{μs}\left({\color{gray}-0.196 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	50 entities	$$4.08 \mathrm{ms} \pm 19.2 \mathrm{μs}\left({\color{gray}-3.213 \mathrm{\%}}\right) $$	Flame Graph

representative_read_entity

Function	Value	Mean	Flame graphs
entity_by_id	entity type ID: https://blockprotocol.org/@alice/types/entity-type/book/v/1	$$16.1 \mathrm{ms} \pm 185 \mathrm{μs}\left({\color{lightgreen}-32.252 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: https://blockprotocol.org/@alice/types/entity-type/person/v/1	$$16.8 \mathrm{ms} \pm 201 \mathrm{μs}\left({\color{lightgreen}-29.123 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: https://blockprotocol.org/@alice/types/entity-type/organization/v/1	$$17.0 \mathrm{ms} \pm 215 \mathrm{μs}\left({\color{gray}3.21 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: https://blockprotocol.org/@alice/types/entity-type/block/v/1	$$16.2 \mathrm{ms} \pm 188 \mathrm{μs}\left({\color{lightgreen}-5.754 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: https://blockprotocol.org/@alice/types/entity-type/building/v/1	$$17.3 \mathrm{ms} \pm 226 \mathrm{μs}\left({\color{gray}4.83 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: https://blockprotocol.org/@alice/types/entity-type/song/v/1	$$17.6 \mathrm{ms} \pm 233 \mathrm{μs}\left({\color{red}11.5 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: https://blockprotocol.org/@alice/types/entity-type/page/v/2	$$17.1 \mathrm{ms} \pm 199 \mathrm{μs}\left({\color{lightgreen}-5.467 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: https://blockprotocol.org/@alice/types/entity-type/playlist/v/1	$$16.8 \mathrm{ms} \pm 207 \mathrm{μs}\left({\color{lightgreen}-14.175 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	entity type ID: https://blockprotocol.org/@alice/types/entity-type/uk-address/v/1	$$17.2 \mathrm{ms} \pm 224 \mathrm{μs}\left({\color{red}5.45 \mathrm{\%}}\right) $$	Flame Graph

representative_read_entity_type

Function	Value	Mean	Flame graphs
get_entity_type_by_id	Account ID: d4e16033-c281-4cde-aa35-9085bf2e7579	$$2.13 \mathrm{ms} \pm 5.51 \mathrm{μs}\left({\color{gray}-0.539 \mathrm{\%}}\right) $$	Flame Graph

representative_read_multiple_entities

Function	Value	Mean	Flame graphs
link_by_source_by_property	depths: DT=0, PT=2, ET=2, E=2	$$87.8 \mathrm{ms} \pm 251 \mathrm{μs}\left({\color{gray}-0.389 \mathrm{\%}}\right) $$	Flame Graph
link_by_source_by_property	depths: DT=0, PT=0, ET=2, E=2	$$84.6 \mathrm{ms} \pm 472 \mathrm{μs}\left({\color{gray}1.39 \mathrm{\%}}\right) $$	Flame Graph
link_by_source_by_property	depths: DT=0, PT=0, ET=0, E=2	$$75.4 \mathrm{ms} \pm 438 \mathrm{μs}\left({\color{gray}0.730 \mathrm{\%}}\right) $$	Flame Graph
link_by_source_by_property	depths: DT=2, PT=2, ET=2, E=2	$$91.8 \mathrm{ms} \pm 402 \mathrm{μs}\left({\color{gray}-0.408 \mathrm{\%}}\right) $$	Flame Graph
link_by_source_by_property	depths: DT=255, PT=255, ET=255, E=255	$$101 \mathrm{ms} \pm 511 \mathrm{μs}\left({\color{gray}0.965 \mathrm{\%}}\right) $$	Flame Graph
link_by_source_by_property	depths: DT=0, PT=0, ET=0, E=0	$$39.2 \mathrm{ms} \pm 143 \mathrm{μs}\left({\color{gray}0.589 \mathrm{\%}}\right) $$	Flame Graph
entity_by_property	depths: DT=0, PT=2, ET=2, E=2	$$54.1 \mathrm{ms} \pm 275 \mathrm{μs}\left({\color{gray}0.636 \mathrm{\%}}\right) $$	Flame Graph
entity_by_property	depths: DT=0, PT=0, ET=2, E=2	$$49.7 \mathrm{ms} \pm 376 \mathrm{μs}\left({\color{gray}0.400 \mathrm{\%}}\right) $$	Flame Graph
entity_by_property	depths: DT=0, PT=0, ET=0, E=2	$$43.4 \mathrm{ms} \pm 146 \mathrm{μs}\left({\color{gray}0.311 \mathrm{\%}}\right) $$	Flame Graph
entity_by_property	depths: DT=2, PT=2, ET=2, E=2	$$57.8 \mathrm{ms} \pm 317 \mathrm{μs}\left({\color{gray}0.117 \mathrm{\%}}\right) $$	Flame Graph
entity_by_property	depths: DT=255, PT=255, ET=255, E=255	$$67.0 \mathrm{ms} \pm 413 \mathrm{μs}\left({\color{gray}1.06 \mathrm{\%}}\right) $$	Flame Graph
entity_by_property	depths: DT=0, PT=0, ET=0, E=0	$$39.5 \mathrm{ms} \pm 217 \mathrm{μs}\left({\color{gray}-1.678 \mathrm{\%}}\right) $$	Flame Graph

scaling_read_entity_complete_one_depth

Function	Value	Mean	Flame graphs
entity_by_id	25 entities	$$85.3 \mathrm{ms} \pm 447 \mathrm{μs}\left({\color{gray}0.445 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	1 entities	$$21.2 \mathrm{ms} \pm 119 \mathrm{μs}\left({\color{gray}-0.545 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	5 entities	$$27.3 \mathrm{ms} \pm 113 \mathrm{μs}\left({\color{gray}-0.156 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	10 entities	$$58.3 \mathrm{ms} \pm 312 \mathrm{μs}\left({\color{red}21.9 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	50 entities	$$5.37 \mathrm{s} \pm 538 \mathrm{ms}\left({\color{red}1889 \mathrm{\%}}\right) $$	Flame Graph

scaling_read_entity_linkless

Function	Value	Mean	Flame graphs
entity_by_id	100 entities	$$2.23 \mathrm{ms} \pm 11.5 \mathrm{μs}\left({\color{gray}4.81 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	1000 entities	$$3.08 \mathrm{ms} \pm 19.4 \mathrm{μs}\left({\color{gray}4.28 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	10000 entities	$$13.9 \mathrm{ms} \pm 63.1 \mathrm{μs}\left({\color{gray}1.16 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	1 entities	$$2.00 \mathrm{ms} \pm 6.43 \mathrm{μs}\left({\color{gray}-0.640 \mathrm{\%}}\right) $$	Flame Graph
entity_by_id	10 entities	$$2.04 \mathrm{ms} \pm 8.68 \mathrm{μs}\left({\color{gray}0.178 \mathrm{\%}}\right) $$	Flame Graph