Generate Symbol.dispose on classes #2475

Job	Run time
build_benchmarks	51s
build_examples	3m 5s
build_nightly	1m 36s
Verify that web-sys is compiled correctly	44s
Check	1m 3s
Clippy	1m 47s
Clippy (project)	2m 32s
Clippy (web-sys)	2m 30s
dist_linux_aarch64_gnu	3m 14s
dist_linux_x86_64_musl	2m 34s
dist_macos_aarch64	1m 13s
dist_macos_x86_64	1m 24s
dist_windows	3m 30s
doc_api	1m 12s
doc_book	5s
Check MSRV for CLI tools	34s
Check MSRV for libraries	54s
Rustfmt	9s
Taplo	6s
Build and test the deno example	58s
Run native tests	1m 34s
Run wasm-bindgen crate tests with multithreading	1m 40s
Run UI compile-fail tests	42s
Run wasm-bindgen crate tests (wasm-bindgen)	4m 2s
Run wasm-bindgen crate tests (wasm-bindgen (serde-serialize))	1m 34s
Run wasm-bindgen crate tests with externref feature	1m 13s
Run wasm-bindgen wasm test	1m 11s
Run wasm-bindgen crate tests (wasm-bindgen (enable-interning))	1m 38s
Run wasm-bindgen crate tests with multi-value feature	1m 15s
Run web-sys tests (with geckodriver)	19s
Run web-sys (all features) tests (with geckodriver)	42s
Run web-sys (unstable, all features) tests (with geckodriver)	45s
Run js-sys tests (with geckodriver)	1m 13s
Run js-sys (unstable) tests (with geckodriver)	1m 20s
Run wasm-bindgen-webidl tests (with geckodriver)	27s
Run webidl-tests tests (with geckodriver)	47s
Run webidl-tests (unstable) tests (with geckodriver)	1m 5s
Run typescript-tests tests (with geckodriver)	1m 12s
test_nightly	1m 1s
test_examples	1m 40s
deploy	28s
	55m 49s

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