Metrics exporter to Prometheus with OTLP #5570

Job	Run time
Basic Checks	19m 33s
Release builds and tests	10m 12s
Additional Builds and Concurrency Tests	14m 5s
sanitize (address)	17m 38s
Slow tests	18m 35s
sanitize (address, multi-threading)	20m 3s
sanitize (leak)	7m 56s
sanitize (leak, multi-threading)	9m 41s
Measure coverage	27m 47s
miri	3m 8s
	2h 28m 38s

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