Rename `KeyCode` to `PhysicalKey` #36032

Job	Run time
build (windows-latest)	4m 31s
check-bevy-internal-imports	6s
build (ubuntu-latest)	3m 21s
check-doc	7m 21s
build (macos-latest)	3m 8s
check-missing-examples-in-docs	28s
ci	3m 13s
miri	6m 57s
run-examples-on-windows-dx12	12m 44s
toml	6s
check-missing-features-in-docs	35s
markdownlint	1m 11s
check-compiles	2m 20s
build-wasm	40s
msrv	1m 8s
	47m 49s

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