feat: add luaurc schema, resolves: #842 #1701

Job	Run time
Lint Extension	16s
Build Server (windows-latest)	4m 25s
Test Extension (macos-latest)	42s
Build Server (ubuntu-20.04)	4m 9s
Verify and Build Roblox Studio Plugin	3m 51s
Test Extension (ubuntu-20.04)	44s
Run Tests (windows-latest)	6m 34s
Build Server (macos-latest)	3m 38s
Test Extension (windows-latest)	3m 3s
Run Tests (ubuntu-20.04)	5m 38s
Run selene	11s
Run stylua	6s
Types Smoketest	4m 15s
	37m 32s

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