Test, lint and coverage

Add support for `logr.Marshaler` #87

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Run time

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Job	Run time
coverage	39s
lint	10s
test (1.20.x, ubuntu-latest)	28s
test (1.20.x, macos-latest)	24s
test (1.20.x, windows-latest)	2m 34s
test (1.21.x, ubuntu-latest)	21s
test (1.21.x, macos-latest)	29s
test (1.21.x, windows-latest)	2m 2s
	7m 7s