Apply only allowed attributes to generated functions #1647

Job	Run time
Clippy	5m 8s
Rustfmt	6s
Verify that web-sys is compiled correctly	52s
Run native tests	1m 50s
Check	1m 3s
Run js-sys crate tests	1m 52s
Run wasm-bindgen crate tests with multithreading enabled	1m 26s
Run wasm-bindgen crate tests (unix)	7m 6s
Run web-sys crate tests	3m 54s
build_benchmarks	51s
build_examples	3m 48s
build_nightly	1m 38s
dist_linux_aarch64_gnu	2m 40s
dist_linux_x86_64_musl	2m 19s
dist_macos_aarch64	1m 50s
dist_macos_x86_64	1m 49s
dist_windows	3m 14s
doc_api	1m 9s
doc_book	11s
Build and test the deno example	47s
Test TypeScript output of wasm-bindgen	1m 21s
Run UI compile-fail tests	2m 39s
Run wasm-bindgen-webidl crate tests	1m 54s
deploy	54s
test_examples	1m 43s
	52m 4s

Provide feedback