Allow to edit subscene entities

[rewin123]

Allow to edit entites, which cannot be stored natively (for example gltf scene entities)

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 184 lines in your changes are missing coverage. Please review.

Project coverage is 31.85%. Comparing base (4abeddb) to head (2ff2358).

❗ Current head 2ff2358 differs from pull request most recent head b29c4ca. Consider uploading reports for the commit b29c4ca to get more accurate results

Files	Patch %	Lines
crates/prefab/src/sub_scene/mod.rs	33.03%	148 Missing ⚠️
crates/editor_ui/src/hierarchy.rs	0.00%	18 Missing ⚠️
crates/prefab/src/spawn_system.rs	5.88%	16 Missing ⚠️
crates/prefab/src/plugins.rs	0.00%	1 Missing ⚠️
crates/prefab/src/save.rs	97.36%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #235      +/-   ##
==========================================
+ Coverage   31.63%   31.85%   +0.21%     
==========================================
  Files          57       58       +1     
  Lines        8408     8677     +269     
==========================================
+ Hits         2660     2764     +104     
- Misses       5748     5913     +165     

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[naomijub]

It works well on my side and doesnt seem to have any code issue. I would just add a few tests, specially for the new module

[naomijub]

Solves #183

[naomijub]

Flaky test failed