[WIP] Trying to add flowchart Langium parser

[stereobooster]

📑 Summary

Trying to add flowchart Langium-based parser

Resolves #4401

📏 Design Decisions

Same approach as others Langium-based parser in this repo

📋 Tasks

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• 💻 have added necessary unit/e2e tests.
• 📓 have added documentation. Make sure MERMAID_RELEASE_VERSION is used for all new features.
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Latest commit: 1cf0c25

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[codecov]

Codecov Report

Attention: Patch coverage is 0% with 81 lines in your changes missing coverage. Please review.

Project coverage is 4.99%. Comparing base (a07f1f3) to head (33991ec).

Files with missing lines	Patch %	Lines
packages/parser/src/language/flowchart/module.ts	0.00%	54 Missing ⚠️
packages/parser/tests/test-util.ts	0.00%	16 Missing ⚠️
...ages/parser/src/language/flowchart/tokenBuilder.ts	0.00%	7 Missing ⚠️
packages/parser/src/language/index.ts	0.00%	3 Missing ⚠️
packages/parser/src/language/flowchart/index.ts	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           develop   #5892      +/-   ##
==========================================
- Coverage     5.00%   4.99%   -0.01%     
==========================================
  Files          337     341       +4     
  Lines        48209   48299      +90     
  Branches       576     554      -22     
==========================================
  Hits          2413    2413              
- Misses       45796   45886      +90     

Flag	Coverage Δ
unit	4.99% <0.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
packages/parser/src/language/flowchart/index.ts	0.00% <0.00%> (ø)
packages/parser/src/language/index.ts	0.00% <0.00%> (ø)
...ages/parser/src/language/flowchart/tokenBuilder.ts	0.00% <0.00%> (ø)
packages/parser/tests/test-util.ts	0.00% <0.00%> (ø)
packages/parser/src/language/flowchart/module.ts	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes