Update dispatch_event to take Event or CustomEvent #1991

Job	Run time	Billable time
Check	58s	0s
Clippy	6m 33s	0s
Verify that web-sys is compiled correctly	45s	0s
Rustfmt	7s	0s
Build and test the deno example	56s	0s
Run js-sys crate tests	1m 57s	0s
Run native tests	1m 37s	0s
Run wasm-bindgen crate tests with multithreading enabled	1m 29s	0s
Test TypeScript output of wasm-bindgen	1m 16s	0s
Run UI compile-fail tests	44s	0s
Run wasm-bindgen crate tests (unix)	6m 24s	0s
Run web-sys crate tests	4m 55s	0s
Run wasm-bindgen-webidl crate tests	1m 58s	0s
build_benchmarks	48s	0s
build_examples	4m 10s	0s
build_nightly	1m 34s	0s
dist_linux_aarch64_gnu	2m 50s	0s
dist_linux_x86_64_musl	2m 17s	0s
dist_macos_aarch64	1m 19s	0s
dist_macos_x86_64	1m 8s	0s
dist_windows	3m 22s	0s
doc_api	1m 11s	0s
doc_book	6s	0s
test_examples	1m 48s	0s
deploy	37s	0s
	50m 49s	0s

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