feat: remove schema concept from grammar

[lars-reimann]

Closes #1133

Summary of Changes

Remove the schema concept from the language. It will instead be provided by the built-in library.

[github-actions]

🦙 MegaLinter status: ✅ SUCCESS

Descriptor	Linter	Files	Fixed	Errors	Elapsed time
✅ JSON	jsonlint	3		0	0.18s
✅ JSON	npm-package-json-lint	yes		no	0.7s
✅ JSON	prettier	3	0	0	0.9s
✅ JSON	v8r	3		0	2.4s
✅ MARKDOWN	markdown-link-check	46		0	1.87s
✅ PYTHON	black	1	0	0	0.9s
✅ PYTHON	mypy	1		0	2.29s
✅ PYTHON	ruff	1	0	0	0.25s
✅ REPOSITORY	git_diff	yes		no	0.22s
✅ TYPESCRIPT	eslint	17	0	0	6.96s
✅ TYPESCRIPT	prettier	17	0	0	1.93s

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.75%. Comparing base (eddd868) to head (c431ee9).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1273      +/-   ##
==========================================
- Coverage   99.75%   99.75%   -0.01%     
==========================================
  Files         113      113              
  Lines       12854    12751     -103     
  Branches     4220     4190      -30     
==========================================
- Hits        12823    12720     -103     
  Misses         31       31              

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[lars-reimann]

🎉 This PR is included in version 0.22.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• npm package (@latest dist-tag)
• v0.22.0
• GitHub release

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