Add prometheus hook to count different log levels #81

Job	Run time
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	2m 43s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	2m 57s
Integration tests (ubuntu-20.04, 1.21, .CLI.)	17m 18s
Build (macos-latest, x86_64-apple-darwin, amd64)	6m 42s
Integration tests (ubuntu-20.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	16m 0s
Build (macos-latest, aarch64-apple-darwin, arm64)	5m 25s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	10m 36s
Integration tests (ubuntu-22.04, 1.21, .CLI.)	16m 10s
Integration tests (ubuntu-22.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	15m 25s
Unit tests (ubuntu-20.04, 1.21)	6m 18s
Unit tests (ubuntu-22.04, 1.21)	6m 25s
	1h 45m 59s

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