Basic Prometheus metrics for API requests (#908) #3058

Job	Run time
Build backend e2e test image	2m 15s
Build frontend e2e test image	4m 7s
lint_core	28s
Build frontend unit test image	1m 52s
Lint mwdb-core web sources	1m 13s
Build mwdb-core core image	3m 1s
Build mwdb-core web image	1m 33s
Perform frontend unit tests	35s
Perform backend e2e tests	5m 7s
Perform frontend e2e tests	3m 32s
Push test images on Docker Hub	1m 2s
Push images on Docker Hub	3m 24s
	28m 9s

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