fix(tracing): propagate span context #530

Job	Run time
semver	2m 26s
Check Style	7s
features	35s
Test with Miri	46s
Check MSRV (1.63)	2m 32s
Test stable on ubuntu-latest	31s
Test stable on windows-latest	2m 13s
Test stable on macos-latest	36s
Test beta on ubuntu-latest	34s
Test beta on windows-latest	1m 13s
Test beta on macos-latest	36s
Test nightly on ubuntu-latest	33s
Test nightly on windows-latest	1m 32s
Test nightly on macos-latest	34s
Build docs	13s
CI is green	1s
	15m 2s

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