Remove class wrap for constructors in Rust exports #1320

Job	Run time
Check	2m 20s
build_nightly	2m 44s
build_examples	4m 5s
build_benchmarks	1m 8s
Verify that web-sys is compiled correctly	1m 32s
Clippy	7m 35s
dist_linux_aarch64_gnu	3m 25s
dist_linux_x86_64_musl	3m 46s
dist_macos_aarch64	12m 40s
dist_macos_x86_64	5m 52s
dist_windows	5m 1s
doc_api	1m 46s
doc_book	25s
Rustfmt	14s
Build and test the deno example	2m 36s
Run js-sys crate tests	2m 57s
Run native tests	3m 17s
Run wasm-bindgen crate tests with multithreading enabled	5m 21s
Test TypeScript output of wasm-bindgen	1m 28s
Run UI compile-fail tests	3m 13s
Run wasm-bindgen crate tests (unix)	1m 52s
Run web-sys crate tests	5m 32s
Run wasm-bindgen-webidl crate tests	3m 39s
test_examples	2m 48s
deploy	1m 12s
	1h 26m 28s

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