Support C federated tests with Rust RTI #33

Job	Run time
check-labels / check	4s
check-diff / check	16s
cli / test-cli (ubuntu-latest)	2m 47s
building / build-toolchain (ubuntu-latest)	1m 30s
cli / test-cli (macos-latest)	4m 41s
building / build-toolchain (macos-latest)	1m 50s
cli / test-cli (windows-latest)	4m 36s
lsp / test-lsp (ubuntu-latest)	7m 11s
lsp / test-lsp (macos-latest)	12m 16s
building / build-toolchain (windows-latest)	1m 59s
lsp / test-lsp (windows-latest)	14m 23s
building / epoch / build-epoch	5m 47s
	57m 20s

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