feat: Initial implementation of many GCD API's using Swift Concurrency #9

Job	Run time
WebAssembly SDK	42s
tests / macOS (Xcode ${{ matrix.xcode_version }} - ${{ matrix.os_version }} - ${{ matrix.arch }})	0s
tests / Linux (nightly-main - jammy)	55s
tests / Linux (6.1 - jammy)	40s
tests / Linux (nightly-6.1 - jammy)	42s
tests / Linux (nightly-6.2 - jammy)	47s
tests / Windows (${{ matrix.swift_version }} - ${{ inputs.enable_windows_docker && contains(matrix.swift_version, 'nightly') && 'windows-2019' \|\| 'windows-2022' }})	0s
Soundness / Documentation check	37s
Soundness / YAML lint check	5s
Soundness / Python lint check	6s
Soundness / License headers check	4s
Soundness / Unacceptable language check	3s
Soundness / API breakage check	-1s
Soundness / Broken symlinks check	4s
Soundness / Format check	34s
Soundness / Shell check	33s
	5m 51s

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