feat: add `tauriReady` function to core #12624

Job	Run time
test (x86_64-pc-windows-msvc, windows-latest, 1.77.2, false, test, --no-default-features, no-defa...	5m 14s
test (x86_64-pc-windows-msvc, windows-latest, 1.77.2, false, test, --all-features, all)	5m 48s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.77.2, false, test, --no-default-features, no-def...	4m 28s
test (x86_64-unknown-linux-gnu, ubuntu-latest, 1.77.2, false, test, --all-features, all)	5m 43s
test (aarch64-apple-darwin, macos-14, 1.77.2, false, test, --no-default-features, no-default)	2m 22s
test (aarch64-apple-darwin, macos-14, 1.77.2, false, test, --all-features, all)	3m 2s
test (aarch64-apple-ios, macos-latest, 1.77.2, false, build, --no-default-features, no-default)	1m 27s
test (aarch64-apple-ios, macos-latest, 1.77.2, false, build, --all-features, all)	1m 6s
test (aarch64-linux-android, ubuntu-latest, 1.77.2, true, build, --no-default-features, no-default)	1m 47s
test (aarch64-linux-android, ubuntu-latest, 1.77.2, true, build, --all-features, all)	1m 14s
	32m 11s

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