Remove class wrap for constructors in Rust exports #1323

Job	Run time
build_examples	4m 45s
build_nightly	2m 23s
Check	1m 40s
build_benchmarks	1m 39s
Verify that web-sys is compiled correctly	1m 46s
Clippy	6m 3s
dist_linux_aarch64_gnu	4m 10s
dist_linux_x86_64_musl	3m 9s
dist_macos_aarch64	3m 34s
dist_macos_x86_64	1h 35m 59s
doc_api	1m 29s
dist_windows	5m 19s
doc_book	10s
Rustfmt	11s
Run js-sys crate tests	3m 0s
Run native tests	2m 33s
Build and test the deno example	1m 14s
Run wasm-bindgen crate tests with multithreading enabled	2m 8s
Test TypeScript output of wasm-bindgen	2m 13s
Run UI compile-fail tests	3m 45s
Run wasm-bindgen crate tests (unix)	3m 38s
Run web-sys crate tests	5m 4s
Run wasm-bindgen-webidl crate tests	3m 27s
test_examples	3m 0s
deploy	1m 13s
	2h 43m 32s

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