chore: initialize Langium component

[lars-reimann]

Closes partially #433.

Summary of Changes

• Initialize Langium component with their Yeoman generator
• Add a small excerpt of the grammar
• Add test utils

[lars-reimann]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ JAVASCRIPT	eslint	1	0	0	3.97s
✅ JAVASCRIPT	prettier	1	0	0	0.72s
✅ JSON	eslint-plugin-jsonc	9	0	0	1.92s
✅ JSON	jsonlint	9		0	0.21s
✅ JSON	npm-package-json-lint	yes		no	0.66s
✅ JSON	prettier	9	0	0	1.17s
✅ JSON	v8r	9		0	7.84s
✅ KOTLIN	ktlint	4	0	0	12.33s
✅ MARKDOWN	markdown-link-check	1		0	0.65s
✅ REPOSITORY	git_diff	yes		no	0.08s
✅ TYPESCRIPT	eslint	17	0	0	5.04s
✅ TYPESCRIPT	prettier	17	0	0	1.7s
✅ YAML	prettier	1	0	0	0.52s
✅ YAML	v8r	1		0	2.49s
✅ YAML	yamllint	1		0	0.25s

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[codecov]

Codecov Report

Merging #455 (dd258de) into main (b920c38) will increase coverage by 0.26%.
The diff coverage is 94.38%.

@@            Coverage Diff             @@
##             main     #455      +/-   ##
==========================================
+ Coverage   78.49%   78.76%   +0.26%     
==========================================
  Files         135      136       +1     
  Lines        5279     5368      +89     
  Branches     1293     1297       +4     
==========================================
+ Hits         4144     4228      +84     
- Misses        760      761       +1     
- Partials      375      379       +4     

Components	Coverage Δ
dsl	78.44% <ø> (ø)
runner	100.00% <ø> (ø)
dsl-langium	94.38% <94.38%> (∅)

Impacted Files	Coverage Δ
...ium/src/language-server/constant/fileExtensions.ts	94.38% <94.38%> (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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