Add directory related functions to `AndroidAssetReader` #38388

Job	Run time
build (windows-latest)	4m 35s
check-bevy-internal-imports	7s
build (ubuntu-latest)	2m 6s
build (macos-latest)	4m 0s
check-cfg	54s
check-doc	7m 42s
check-missing-examples-in-docs	35s
ci	1m 45s
miri	6m 2s
run-examples-macos-metal	4m 23s
toml	1m 56s
typos	5s
check-missing-features-in-docs	28s
markdownlint	1m 11s
check-compiles	2m 9s
build-wasm	37s
msrv	54s
	39m 29s

Provide feedback