tests

Add c_bindings feature when running tests in CI #211

Job	Run time
backend_ci (ubuntu-latest, blst)	15m 9s
backend_ci (ubuntu-latest, zkcrypto)	31m 35s
backend_ci (ubuntu-latest, arkworks)	20m 12s
backend_ci (ubuntu-latest, arkworks3)	18m 13s
backend_ci (ubuntu-latest, constantine)	26m 18s
backend_ci (windows-latest, blst)	6m 2s
backend_ci (windows-latest, zkcrypto)	9m 40s
backend_ci (windows-latest, arkworks)	6m 50s
backend_ci (windows-latest, arkworks3)	6m 26s
backend_ci (windows-latest, constantine)	10m 43s
kzg_ci	38s
backend_ci (macos-latest, blst)	6m 29s
backend_ci (macos-latest, zkcrypto)	9m 17s
backend_ci (macos-latest, arkworks)	7m 21s
backend_ci (macos-latest, arkworks3)	7m 42s
backend_ci (macos-latest, constantine)	11m 35s
	3h 14m 10s

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