feat: Add a `Error::is_connect()` method #313

Job	Run time
semver	15s
Check Style	9s
features	42s
Test with Miri	48s
Check MSRV (1.63)	2m 55s
Test stable on ubuntu-latest	33s
Test stable on windows-latest	1m 11s
Test stable on macOS-latest	1m 0s
Test beta on ubuntu-latest	36s
Test beta on windows-latest	1m 17s
Test beta on macOS-latest	1m 3s
Test nightly on ubuntu-latest	34s
Test nightly on windows-latest	1m 23s
Test nightly on macOS-latest	1m 21s
Build docs	12s
CI is green	1s
	14m 0s

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