Add ML-DSA post-quantum signatures to `_CryptoExtras` #36

Job	Run time
Soundness / Documentation check	37s
Soundness / API breakage check	1m 31s
Check cmake lists / Linux (5.9)	39s
Check cmake lists / Windows (nightly-6.0)	2s
Check cmake lists / Linux (5.10)	32s
Check cmake lists / Windows (nightly-main)	1s
Soundness / License headers check	6s
Check cmake lists / Linux (6.0)	38s
Soundness / Unacceptable language check	6s
Check cmake lists / Linux (nightly-6.0)	39s
Check cmake lists / Linux (nightly-main)	39s
Check cmake lists / Windows (${{ matrix.swift.swift_version }})	0s
Soundness / Broken symlinks check	5s
Soundness / Format check	0s
Soundness / Python lint check	10s
Soundness / Shell check	39s
Soundness / YAML lint check	6s
Cxx interop / Cxx interop / Windows (${{ matrix.swift.swift_version }})	0s
Cxx interop / Cxx interop / Linux (5.9)	1m 11s
Cxx interop / Cxx interop / Windows (nightly-6.0)	2s
Cxx interop / Cxx interop / Linux (5.10)	58s
Cxx interop / Cxx interop / Windows (nightly-main)	3s
Cxx interop / Cxx interop / Linux (6.0)	1m 13s
Unit tests / Unit tests / Linux (5.9)	3m 25s
Cxx interop / Cxx interop / Linux (nightly-6.0)	1m 25s
Unit tests / Unit tests / Linux (5.10)	3m 24s
Cxx interop / Cxx interop / Linux (nightly-main)	1m 19s
Unit tests / Unit tests / Windows (${{ matrix.swift.swift_version }})	0s
Unit tests / Unit tests / Linux (6.0)	3m 45s
Unit tests / Unit tests / Linux (nightly-6.0)	3m 57s
Unit tests / Unit tests / Linux (nightly-main)	3m 52s
Unit tests / Unit tests / Windows (nightly-6.0)	2s
Unit tests / Unit tests / Windows (nightly-main)	3s
	31m 9s

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