chore: make development system filesystem-aware

[tstirrat15]

Description

This PR makes the development package filesystem-aware, which means that it can validate schemas that use import syntax.

It also updates the language server logic to use an overlay filesystem that allows for validation of open files.

TODOs

• Merge this before merging chore: bring in spicedb and update compilation zed#635
• Make sure that this works with spicedb-vscode. There may be an issue with spicedb-vscode where it wants to use the WASM package to validate the schema and/or do check watches, rather than the LSP, which probably won't work for composable schemas; if that's the case we need to update spicedb-vscode accordingly. That can happen in subsequent work, since spicedb-vscode doesn't currently work with composable schema stuff.

Changes

TODO

Testing

TODO

[codecov]

Codecov Report

❌ Patch coverage is 11.33333% with 133 lines in your changes missing coverage. Please review.
✅ Project coverage is 48.84%. Comparing base (0e16dd1) to head (9ef3b65).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/development/schema_position_mapper.go	0.00%	56 Missing ⚠️
pkg/schemadsl/compiler/development.go	0.00%	47 Missing ⚠️
pkg/development/schema.go	33.34%	6 Missing and 2 partials ⚠️
pkg/schemadsl/compiler/positionmapper.go	56.25%	7 Missing ⚠️
pkg/schemadsl/compiler/translator.go	0.00%	7 Missing ⚠️
pkg/schemadsl/compiler/importer.go	0.00%	5 Missing ⚠️
pkg/caveats/parameters.go	0.00%	3 Missing ⚠️

❌ Your project check has failed because the head coverage (48.84%) is below the target coverage (75.00%). You can increase the head coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2965      +/-   ##
==========================================
- Coverage   48.88%   48.84%   -0.03%     
==========================================
  Files         429      430       +1     
  Lines       54628    54678      +50     
==========================================
+ Hits        26700    26704       +4     
- Misses      25220    25257      +37     
- Partials     2708     2717       +9     

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