Support C federated tests with Rust RTI #26

Job	Run time
check-diff / check	15s
check-labels / check	4s
building / build-toolchain (ubuntu-latest)	1m 31s
lsp / test-lsp (ubuntu-latest)	6m 42s
building / build-toolchain (macos-latest)	1m 43s
building / build-toolchain (windows-latest)	2m 0s
lsp / test-lsp (macos-latest)	17m 22s
cli / test-cli (ubuntu-latest)	2m 41s
lsp / test-lsp (windows-latest)	14m 8s
cli / test-cli (macos-latest)	5m 57s
cli / test-cli (windows-latest)	4m 56s
building / epoch / build-epoch	5m 16s
	1h 2m 35s

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