feat(pool): add a Negotiate pooling service #734

Job	Run time
semver	25s
Check Style	11s
features	54s
Test with Miri	1m 7s
Check MSRV (1.63)	1m 51s
Test beta on macos-latest	46s
Test beta on windows-latest	1m 34s
Test stable on ubuntu-latest	40s
Test stable on windows-latest	2m 58s
Test nightly on macos-latest	38s
Test nightly on ubuntu-latest	38s
Test stable on macos-latest	45s
Test nightly on windows-latest	1m 19s
Test beta on ubuntu-latest	36s
Build docs	20s
CI is green	2s
	14m 44s

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