avm2: `StyleSheet` should extend `EventDispatcher` #169

Job	Run time
Paths filter	8s
Check dependencies	1m 38s
Test Rust stable / ubuntu-22.04	4m 45s
Lints with Rust stable	4m 19s
Test Rust ${{ matrix.rust_version }} / ${{ matrix.os }}	0s
Test Rust stable / windows-latest	11m 49s
Lints with Rust beta	4m 33s
Test Rust stable / macos-14	3m 34s
Lints with Rust nightly	4m 16s
Test Rust nightly / ubuntu-22.04	4m 34s
Test Rust beta / ubuntu-22.04	4m 42s
	44m 18s

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