Multithreaded Encryption (#1491) #5579

Job	Run time
Additional Builds and Concurrency Tests	13m 37s
Slow tests	18m 20s
Basic Checks	21m 34s
Measure coverage	27m 24s
miri	4m 30s
Release builds and tests	9m 58s
sanitize (address)	17m 50s
sanitize (address, multi-threading)	18m 54s
sanitize (leak)	7m 40s
sanitize (leak, multi-threading)	8m 13s
	2h 28m 0s

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