feat: establish language server service for the graphical editor

[GideonKoenig]

Related to #1243.

Summary of Changes

Adds a language server service that provides the necessary components for the graphical editor.

[GideonKoenig]

Currently, this PR is still missing the necessary tests for the parser components.
Tests for the Document Parser will get added.

Testing components that are not related to ParseDocument (specifically, OpenSyncChannel, CloseSyncChannel, GetBuildings, and GetDocumentation) is currently not planned.

@lars-reimann If these components require testing, please let me know.

[github-actions]

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✅ REPOSITORY	git_diff	yes		no	0.14s
✅ TYPESCRIPT	eslint	17	0	0	4.62s
✅ TYPESCRIPT	prettier	17	0	0	1.09s

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[codecov]

Codecov Report

Attention: Patch coverage is 20.55961% with 653 lines in your changes missing coverage. Please review.

Project coverage is 95.00%. Comparing base (373d404) to head (1100ecb).

Files with missing lines	Patch %	Lines
...g/src/language/graphical-editor/ast-parser/call.ts	5.32%	160 Missing ⚠️
...uage/graphical-editor/graphical-editor-provider.ts	30.66%	104 Missing ⚠️
...src/language/graphical-editor/ast-parser/parser.ts	14.28%	96 Missing ⚠️
.../language/graphical-editor/ast-parser/statement.ts	10.38%	69 Missing ⚠️
...e/graphical-editor/ast-parser/tools/debug-utils.ts	9.43%	48 Missing ⚠️
...language/graphical-editor/ast-parser/expression.ts	15.38%	44 Missing ⚠️
...rc/language/graphical-editor/ast-parser/segment.ts	14.28%	36 Missing ⚠️
...g/src/language/graphical-editor/ast-parser/edge.ts	37.50%	25 Missing ⚠️
...afe-ds-lang/src/language/graphical-editor/types.ts	37.50%	15 Missing ⚠️
...c/language/graphical-editor/ast-parser/argument.ts	27.77%	13 Missing ⚠️
... and 5 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1315      +/-   ##
==========================================
- Coverage   99.72%   95.00%   -4.73%     
==========================================
  Files         119      134      +15     
  Lines       12955    13777     +822     
  Branches     4240     4248       +8     
==========================================
+ Hits        12920    13089     +169     
- Misses         35      687     +652     
- Partials        0        1       +1     

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[GideonKoenig]

@lars-reimann
Before reviewing this, see my comment here.

[GideonKoenig]

Bug 1
Has been resolved, among some other small issues.

Bug 2
This seems the be an issue with langium, or an issue with how I use the provided services.

this.logger.error(`Parsing document <${uri.path}>`);
const document = await this.LangiumDocuments.getOrCreateDocument(uri);
this.logger.error(`Document created <${document.uri.path}>`);
await this.DocumentBuilder.build([document]);
this.logger.error(`Document built <${document.uri.path}>`);

I added these debug logging statements in the parseDocument function in the language server, then opened first the complex-titanic.sds file in the editor, then closed the graphical editor, and the opened .sds document, then opened the simple-titanic.sds file in the text editor, and then the graphical editor.

These log statements were produced after opening the simple-titanic.sds file:

2025-01-22 00:16:33.692 [error] [Graphical Editor] Parsing document </c:/Users/Gideon/projects/safe-ds/packages/safe-ds-editor/samples/simple-titanic.sds>
2025-01-22 00:16:33.693 [error] [Graphical Editor] Document created </c:/Users/Gideon/projects/safe-ds/packages/safe-ds-editor/samples/complex-titanic.sds>
2025-01-22 00:16:33.693 [error] [Graphical Editor] Document built </c:/Users/Gideon/projects/safe-ds/packages/safe-ds-editor/samples/complex-titanic.sds>

So it seems that this line:

const document = await this.LangiumDocuments.getOrCreateDocument(uri);

produces the old document, when using the new uri.