refactor: allow resolve span to be disabled #492

Job	Run time
Check Style	9s
semver	18s
features	32s
Test with Miri	46s
Test stable on ubuntu-latest	28s
Test stable on windows-latest	2m 36s
Check MSRV (1.63)	59s
Test stable on macos-latest	33s
Test beta on ubuntu-latest	35s
Test beta on windows-latest	1m 7s
Test beta on macos-latest	32s
Test nightly on ubuntu-latest	34s
Test nightly on windows-latest	1m 9s
Test nightly on macos-latest	30s
Build docs	13s
CI is green	1s
	11m 2s

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