Migrate CI to use swiftlang / SwiftNIO common GitHub Actions. #6

Job	Run time
Soundness / Swift license headers check	2s
Soundness / Check generated code	1m 54s
Soundness / API breakage check	1m 34s
Soundness / Documentation check	1m 27s
Soundness / License headers check	5s
Soundness / Unacceptable language check	5s
Soundness / Broken symlinks check	4s
Soundness / Format check	36s
Soundness / Python lint check	7s
Soundness / YAML lint check	3s
Soundness / Shell check	36s
Cxx interop / Cxx interop / Linux (5.9)	25s
Cxx interop / Cxx interop / Windows (6.0)	1s
Cxx interop / Cxx interop / Windows (nightly-6.0)	2s
Cxx interop / Cxx interop / Linux (5.10)	27s
Cxx interop / Cxx interop / Windows (nightly-main)	1s
Cxx interop / Cxx interop / Linux (6.0)	1m 21s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 49s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 31s
Unit tests / Unit tests / Linux (5.9)	25s
Unit tests / Unit tests / Linux (5.10)	27s
Unit tests / Unit tests / Windows (6.0)	1s
Unit tests / Unit tests / Windows (nightly-6.0)	3s
Unit tests / Unit tests / Linux (6.0)	1m 27s
Unit tests / Unit tests / Windows (nightly-main)	3s
Unit tests / Unit tests / Linux (nightly-6.0)	1m 34s
Unit tests / Unit tests / Linux (nightly-main)	1m 33s
	17m 43s

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