logger: add log_debugf, rework logger to accept `Display` #380

Job	Run time
health checks	1m 3s
build+test x86_64-unknown-linux-gnu on ubuntu-20.04	59s
build aarch64-unknown-linux-gnu on ubuntu-20.04	1m 18s
build x86_64-apple-darwin on macos-13	1m 13s
build aarch64-apple-darwin on macos-latest	1m 7s
build+test x86_64-pc-windows-msvc on windows-latest	5m 23s
build aarch64-pc-windows-msvc on windows-latest	2m 44s
	13m 47s

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