feat(pool): add a Negotiate pooling service #844

Job	Run time
semver	25s
Check Style	10s
Check MSRV (1.63) on windows-latest	4m 33s
Check MSRV (1.63) on ubuntu-latest	2m 51s
Check MSRV (1.63) on macos-latest	2m 54s
Test with Miri	1m 9s
features	46s
Test stable on ubuntu-latest	43s
Test stable on windows-latest	1m 32s
Test stable on macos-latest	35s
Test nightly on windows-latest	1m 26s
Test beta on windows-latest	1m 21s
Test nightly on ubuntu-latest	36s
Test beta on ubuntu-latest	36s
Test nightly on macos-latest	1m 5s
Test beta on macos-latest	1m 7s
Build docs	23s
CI is green	4s
	22m 16s

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