Add `WorkerGlobalScope.performance` #1244

Job	Run time
build_benchmarks	1m 31s
build_examples	4m 27s
Check	1m 49s
build_nightly	2m 5s
Verify that web-sys is compiled correctly	1m 27s
Clippy	6m 21s
dist_linux_aarch64_gnu	3m 35s
dist_linux_x86_64_musl	4m 3s
dist_macos_aarch64	2m 54s
dist_macos_x86_64	2m 55s
doc_api	1m 52s
dist_windows	6m 14s
doc_book	15s
Rustfmt	12s
Build and test the deno example	1m 47s
Run js-sys crate tests	3m 23s
Run native tests	3m 24s
Run wasm-bindgen crate tests with multithreading enabled	2m 10s
Test TypeScript output of wasm-bindgen	2m 5s
Run UI compile-fail tests	2m 34s
Run wasm-bindgen crate tests (unix)	15m 46s
Run web-sys crate tests	6m 36s
Run wasm-bindgen-webidl crate tests	4m 8s
test_examples	3m 24s
deploy	2m 2s
	1h 26m 59s

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