Add RSC-based static site generator #4224

Job	Run time
Flow	56s
Benchmarks	9m 41s
Lint	59s
TypeScript types	1m 43s
Integration tests (ubuntu-latest, Node 18)	8m 37s
Build REPL	10m 53s
Unit tests (ubuntu-latest, Node 18)	2m 50s
Integration tests (macos-latest, Node 18)	10m 9s
Unit tests (macos-latest, Node 18)	2m 35s
Integration tests (windows-latest, Node 18)	21m 17s
Integration tests (ubuntu-latest, Node 20)	8m 14s
Unit tests (windows-latest, Node 18)	14m 45s
Integration tests (macos-latest, Node 20)	9m 4s
Unit tests (ubuntu-latest, Node 20)	2m 41s
Integration tests (windows-latest, Node 20)	19m 50s
Unit tests (macos-latest, Node 20)	3m 49s
Unit tests (windows-latest, Node 20)	10m 0s
	2h 18m 3s

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