Export `Span` type for using `startInactiveSpan` #4970

Job	Run time
diff_check / diff_check	9s
Build legacy android dev no-frameworks	4m 38s
Build legacy android production no-frameworks	5m 40s
Build legacy ios dev no-frameworks	17m 59s
Build legacy ios production no-frameworks	18m 20s
Build legacy macos dev no-frameworks	12m 53s
Build legacy macos production no-frameworks	13m 24s
Build legacy ios dev dynamic-frameworks	18m 53s
Build legacy ios production dynamic-frameworks	19m 1s
Build new android dev no-frameworks	6m 38s
Build new android production no-frameworks	7m 19s
Build new ios dev no-frameworks	20m 25s
Build new ios production no-frameworks	20m 31s
	2h 45m 50s

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