Implement `UnitsFormatter` (#5000) #2024

Job	Run time
Check Credentials for jobs that need JSON credentials	3s
WASM Demo	1m 58s
bench-binsize	2m 51s
bench-memory (macos-latest)	3m 23s
bench-memory (ubuntu-latest)	3m 50s
bench-memory (windows-latest)	1s
bench-perf (components/collections)	4m 42s
bench-perf (components/datetime)	4m 14s
bench-perf (components/locale)	2m 41s
bench-perf (components/locale_core)	5m 22s
bench-perf (components/plurals)	7m 49s
bench-perf (components/segmenter)	3m 37s
bench-perf (provider/blob)	3m 35s
bench-perf (utils/fixed_decimal)	6m 13s
bench-perf (utils/litemap)	2m 16s
bench-perf (utils/tinystr)	6m 40s
bench-perf (utils/writeable)	3m 35s
bench-perf (utils/zerotrie)	5m 44s
bench-perf (utils/zerovec)	8m 33s
Dart docs	1m 23s
Rust docs	4m 51s
C++ docs	1m 46s
TypeScript docs	37s
Deploy to GitHub Pages	21m 39s
	1h 47m 23s

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