Generate Symbol.dispose on classes #2479

Job	Run time
build_examples	3m 5s
build_nightly	1m 41s
build_benchmarks	56s
Verify that web-sys is compiled correctly	46s
Check	1m 4s
Clippy	2m 48s
Clippy (project)	2m 33s
Clippy (web-sys)	2m 46s
dist_linux_aarch64_gnu	3m 6s
dist_linux_x86_64_musl	2m 35s
dist_macos_x86_64	1m 29s
dist_macos_aarch64	1m 14s
doc_api	1m 11s
doc_book	5s
Check MSRV for CLI tools	31s
dist_windows	4m 17s
Check MSRV for libraries	55s
Rustfmt	22s
Taplo	8s
Build and test the deno example	50s
Run native tests	1m 26s
Run wasm-bindgen crate tests with multithreading	1m 47s
Run UI compile-fail tests	42s
Run wasm-bindgen crate tests (wasm-bindgen)	1m 59s
Run wasm-bindgen crate tests (wasm-bindgen (serde-serialize))	3m 40s
Run wasm-bindgen crate tests with externref feature	1m 27s
Run wasm-bindgen wasm test	1m 13s
Run wasm-bindgen crate tests (wasm-bindgen (enable-interning))	1m 20s
Run wasm-bindgen crate tests with multi-value feature	1m 43s
Run web-sys tests (with geckodriver)	28s
Run web-sys (all features) tests (with geckodriver)	2m 54s
Run web-sys (unstable, all features) tests (with geckodriver)	5m 30s
Run js-sys tests (with geckodriver)	1m 21s
Run js-sys (unstable) tests (with geckodriver)	1m 34s
Run wasm-bindgen-webidl tests (with geckodriver)	36s
Run webidl-tests tests (with geckodriver)	1m 39s
Run webidl-tests (unstable) tests (with geckodriver)	1m 11s
Run typescript-tests tests (with geckodriver)	1m 18s
test_nightly	40s
test_examples	1m 50s
deploy	33s
	1h 7m 13s

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