sql: include DB name in create_statement in create_type_statements

[yuzefovich]

This commit updates how we populate crdb_internal.create_type_statements virtual table so that create_statement column included the DB name (previously only the schema and the UDT name were included). This will make it easier to reproduce stmt bundles with cross-DB references.

Also, this commit fixes how we use this virtual table during bundle creation - we now properly use "".crdb_internal search path and cast the type oid to OID type. The same fix is applied for create_function_statements and create_procedure_statements vtables.

Epic: None
Release note: None

[cockroach-teamcity]

This change is 

[rafiss]

lgtm! thanks for this improvement. is there anything remaining to resolve #137579 now?

Reviewable status: complete! 0 of 0 LGTMs obtained (waiting on @Dedej-Bergin)

[yuzefovich]

TFTR and for the suggestion!

For #137579 - I think there is still unexpected behavior when we use the virtual index without OID cast - I'd assume this should return 0 rows:

SELECT * FROM crdb_internal.create_type_statements WHERE descriptor_id = (SELECT 'db.public.enum'::REGTYPE::INT - 100000);
--          100 | defaultdb     | public      |           108 | enum            | CREATE TYPE public.enum AS ENUM ('x', 'y', 'z') | {x,y,z}

But I'm not sure if it's important and whether we should do anything about it. I'm no longer blocked on that issue, and if you think we wouldn't want to change the behavior, I'm ok closing it.

bors r+

[craig]

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[michae2]

I thought after #125996 we were using two-part names in SHOW CREATE output. This PR changes the output of SHOW CREATE ALL TYPES to include database name. It seems like this might break some external tools, e.g. as described in #125827.

[yuzefovich]

Hm, yeah, that's true - we now will see the DB name in the output of SHOW CREATE ALL TYPES. Looks like we haven't documented this feature in detail (cockroachdb/docs#12187 is still open), but the syntax does show up in the diagram at https://www.cockroachlabs.com/docs/stable/show-create.