Support C federated tests with Rust RTI #34

Job	Run time
check-diff / check	16s
check-labels / check	2s
lsp / test-lsp (ubuntu-latest)	7m 27s
lsp / test-lsp (macos-latest)	15m 30s
cli / test-cli (ubuntu-latest)	3m 11s
lsp / test-lsp (windows-latest)	15m 21s
cli / test-cli (macos-latest)	5m 42s
building / build-toolchain (ubuntu-latest)	1m 21s
cli / test-cli (windows-latest)	4m 45s
building / build-toolchain (macos-latest)	1m 35s
building / build-toolchain (windows-latest)	1m 34s
building / epoch / build-epoch	4m 35s
	1h 1m 19s

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