Add experimental `ViewTransition` interface #1378

Job	Run time
build_examples	4m 35s
build_examples	4m 35s
build_benchmarks	1m 39s
build_benchmarks	1m 39s
Check	1m 51s
Check	1m 51s
build_nightly	2m 57s
build_nightly	2m 57s
Verify that web-sys is compiled correctly	2m 13s
Verify that web-sys is compiled correctly	2m 13s
Clippy	10m 0s
Clippy	10m 0s
dist_linux_aarch64_gnu	4m 18s
dist_linux_aarch64_gnu	4m 18s
dist_linux_x86_64_musl	3m 54s
dist_linux_x86_64_musl	3m 54s
dist_macos_aarch64	3m 0s
dist_macos_aarch64	3m 0s
dist_macos_x86_64	3m 50s
dist_macos_x86_64	3m 50s
dist_windows	6m 20s
dist_windows	6m 20s
doc_api	1m 56s
doc_api	1m 56s
doc_book	39s
doc_book	39s
Rustfmt	26s
Rustfmt	26s
Build and test the deno example	2m 15s
Build and test the deno example	2m 15s
Run js-sys crate tests	4m 58s
Run js-sys crate tests	4m 58s
Run native tests	2m 49s
Run native tests	2m 49s
Run wasm-bindgen crate tests with multithreading enabled	4m 11s
Run wasm-bindgen crate tests with multithreading enabled	4m 11s
Test TypeScript output of wasm-bindgen	2m 31s
Test TypeScript output of wasm-bindgen	2m 31s
Run UI compile-fail tests	4m 4s
Run UI compile-fail tests	4m 4s
Run wasm-bindgen crate tests (unix)	12m 29s
Run wasm-bindgen crate tests (unix)	12m 29s
Run web-sys crate tests	7m 8s
Run web-sys crate tests	7m 8s
Run wasm-bindgen-webidl crate tests	5m 14s
Run wasm-bindgen-webidl crate tests	5m 14s
test_examples	3m 44s
test_examples	3m 24s
deploy	1m 20s
deploy	1m 20s
	3h 16m 22s

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