Support C federated tests with Rust RTI #42

Job	Run time
check-labels / check	2s
check-diff / check	18s
building / build-toolchain (ubuntu-latest)	1m 20s
building / build-toolchain (macos-latest)	1s
building / build-toolchain (windows-latest)	1m 57s
cli / test-cli (ubuntu-latest)	2m 45s
cli / test-cli (macos-latest)	4m 7s
cli / test-cli (windows-latest)	4m 50s
lsp / test-lsp (ubuntu-latest)	7m 4s
lsp / test-lsp (macos-latest)	13m 28s
lsp / test-lsp (windows-latest)	13m 54s
building / epoch / build-epoch	8m 8s
	57m 54s

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