Add impls for the Defmt logging crate #3505

Job	Run time
alternative_targets (ubuntu-latest, wasm32-unknown-emscripten)	19s
features_check (ubuntu-latest)	5m 52s
alternative_targets (ubuntu-latest, aarch64-apple-ios)	19s
no_std (ubuntu-latest, thumbv6m-none-eabi)	1m 20s
alternative_targets (ubuntu-latest, aarch64-linux-android)	17s
rust_msrv (ubuntu-latest)	2m 11s
no_std (ubuntu-latest, x86_64-fortanix-unknown-sgx)	26s
rust_versions (ubuntu-latest, stable)	1m 23s
rust_versions (ubuntu-latest, beta)	1m 36s
check-docs	22s
rust_versions (ubuntu-latest, nightly)	1m 23s
timezones (ubuntu-latest, ACST-9:30)	1m 34s
timezones (ubuntu-latest, EST4)	1m 29s
cross-targets (x86_64-unknown-illumos)	1m 26s
timezones (ubuntu-latest, UTC0)	1m 29s
cross-tests (ubuntu-latest)	1m 59s
timezones (ubuntu-latest, Asia/Katmandu)	1m 31s
timezones (macos-latest, ACST-9:30)	57s
test_wasi (ubuntu-latest, wasm32-wasi)	35s
test_wasm (ubuntu-latest)	32s
timezones (macos-latest, EST4)	51s
timezones (macos-latest, UTC0)	57s
timezones (macos-latest, Asia/Katmandu)	1m 10s
timezones (windows-latest, ACST-9:30)	3m 27s
timezones (windows-latest, EST4)	1m 55s
timezones (windows-latest, UTC0)	2m 40s
timezones (windows-latest, Asia/Katmandu)	1m 53s
	39m 53s

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