Add a getter for asset watching status on `AssetServer` (#11578) #261

Job	Run time
build (windows-latest)	7m 36s
ci	3m 51s
build (ubuntu-latest)	3m 24s
miri	7m 8s
build (macos-latest)	8m 54s
check-bevy-internal-imports	6s
check-doc	7m 37s
check-missing-examples-in-docs	32s
run-examples-on-windows-dx12	15m 51s
toml	4s
check-missing-features-in-docs	34s
markdownlint	1m 18s
check-compiles	4m 23s
build-wasm	1m 28s
msrv	2m 7s
	1h 4m 53s

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