Add support for Windows #42

Job	Run time
Cxx interop / Construct Cxx interop matrix	3s
macOS tests / Construct Darwin matrix	2s
Unit tests / Construct unit test matrix	3s
Soundness / API breakage check	1m 8s
Soundness / Documentation check	1m 13s
Soundness / Broken symlinks check	2s
Soundness / Format check	33s
Soundness / License headers check	5s
Soundness / Unacceptable language check	5s
Soundness / Python lint check	5s
Soundness / Shell check	34s
Soundness / YAML lint check	3s
Cxx interop / Cxx interop / Linux (5.9)	45s
Cxx interop / Cxx interop / Linux (5.10)	46s
Cxx interop / Cxx interop / Linux (6.0)	1m 1s
Cxx interop / Cxx interop / Linux (nightly-next)	1m 5s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 5s
macOS tests / Xcode 16.1	2m 21s
macOS tests / Xcode 16.2	2m 14s
macOS tests / Xcode 16.3	2m 42s
Unit tests / Unit tests / Linux (5.9)	1m 11s
Unit tests / Unit tests / Linux (5.10)	1m 9s
Unit tests / Unit tests / Linux (6.0)	1m 27s
Unit tests / Unit tests / Linux (nightly-next)	1m 39s
Unit tests / Unit tests / Linux (nightly-main)	1m 40s
Unit tests / Unit tests / Windows (6.0)	12m 25s
Unit tests / Unit tests / Windows (nightly-next)	9m 46s
Unit tests / Unit tests / Windows (nightly-main)	10m 52s
	56m 4s

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