Remove class wrap for constructors in Rust exports #1324

Job	Run time
build_examples	5m 29s
build_nightly	3m 9s
Check	1m 59s
build_benchmarks	1m 28s
Verify that web-sys is compiled correctly	1m 54s
Clippy	7m 28s
dist_linux_aarch64_gnu	3m 42s
dist_linux_x86_64_musl	3m 53s
dist_macos_aarch64	3m 12s
dist_macos_x86_64	6m 55s
dist_windows	4m 23s
doc_api	1m 25s
doc_book	36s
Rustfmt	15s
Run js-sys crate tests	3m 43s
Build and test the deno example	2m 19s
Run native tests	2m 50s
Run wasm-bindgen crate tests with multithreading enabled	4m 48s
Test TypeScript output of wasm-bindgen	1m 37s
Run UI compile-fail tests	3m 35s
Run wasm-bindgen crate tests (unix)	13m 29s
Run web-sys crate tests	6m 16s
Run wasm-bindgen-webidl crate tests	4m 4s
test_examples	3m 59s
deploy	1m 55s
	1h 34m 23s

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