Remove class wrap for constructors in Rust exports #1316

Job	Run time
build_examples	1m 24s
Check	1m 23s
build_benchmarks	1m 24s
build_nightly	1m 25s
Verify that web-sys is compiled correctly	1m 25s
Clippy	1m 27s
dist_linux_aarch64_gnu	1m 26s
dist_linux_x86_64_musl	1m 24s
dist_macos_aarch64	1m 18s
dist_macos_x86_64	1m 23s
doc_api	1m 23s
doc_book	14s
Rustfmt	9s
Build and test the deno example	1m 24s
Run js-sys crate tests	1m 23s
Run native tests	1m 23s
dist_windows	1m 19s
Run wasm-bindgen crate tests with multithreading enabled	1m 24s
Test TypeScript output of wasm-bindgen	1m 24s
Run UI compile-fail tests	1m 22s
Run wasm-bindgen crate tests (unix)	1m 8s
Run web-sys crate tests	1s
Run wasm-bindgen-webidl crate tests	1m 7s
test_examples	1s
deploy	1s
	27m 42s

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