Add bindings for `VisualViewport` #1971

Job	Run time
Run wasm-bindgen crate tests (unix)	4m 11s
Clippy	6m 52s
Verify that web-sys is compiled correctly	41s
Rustfmt	6s
Check	54s
Build and test the deno example	45s
Run js-sys crate tests	1m 55s
Run native tests	1m 41s
Test TypeScript output of wasm-bindgen	1m 12s
Run web-sys crate tests	5m 1s
Run wasm-bindgen-webidl crate tests	2m 6s
build_benchmarks	54s
build_examples	4m 1s
build_nightly	1m 41s
dist_linux_aarch64_gnu	2m 44s
dist_linux_x86_64_musl	2m 21s
dist_macos_aarch64	4m 44s
dist_macos_x86_64	3m 24s
dist_windows	3m 6s
doc_api	1m 10s
doc_book	5s
Run wasm-bindgen crate tests with multithreading enabled	3m 25s
Run UI compile-fail tests	42s
test_examples	1m 47s
deploy	28s
	55m 56s

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