test: data-driven generator test system

[WinPlay02]

Closes partially #542

Summary of Changes

Port generation test system to Langium.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ MARKDOWN	markdown-link-check	5		0	0.38s
✅ REPOSITORY	git_diff	yes		no	0.06s
✅ TYPESCRIPT	eslint	14	0	0	5.1s
✅ TYPESCRIPT	prettier	14	0	0	1.2s

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[codecov]

Codecov Report

Merging #605 (4d7dfb6) into main (9c59943) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              main      #605    +/-   ##
==========================================
  Coverage   100.00%   100.00%            
==========================================
  Files           38        40     +2     
  Lines         5374      5478   +104     
  Branches       989       992     +3     
==========================================
+ Hits          5374      5478   +104     

Files	Coverage Δ
src/cli/cli-util.ts	100.00% <100.00%> (ø)
src/cli/generator.ts	100.00% <100.00%> (ø)

[lars-reimann]

🎉 This PR is included in version 0.2.0 🎉

The release is available on:

• Visual Studio Marketplace
• GitHub release

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