Implement `Any/BufferProvider` for some smart pointers (#4255) #1264

Job	Run time
Check Credentials for jobs that need JSON credentials	7s
WASM Demo	9m 16s
bench-binsize	9m 50s
bench-datasize	29m 15s
bench-memory (macos-latest)	26m 49s
bench-memory (ubuntu-latest)	7m 33s
bench-memory (windows-latest)	12m 28s
bench-perf (components/collections)	5m 45s
bench-perf (components/datetime)	4m 33s
bench-perf (components/locid)	7m 32s
bench-perf (components/locid_transform)	2m 44s
bench-perf (components/plurals)	6m 11s
bench-perf (experimental/transliterate)	2m 45s
bench-perf (components/segmenter)	3m 51s
bench-perf (experimental/zerotrie)	5m 34s
bench-perf (provider/blob)	5m 48s
bench-perf (utils/fixed_decimal)	4m 6s
bench-perf (utils/litemap)	3m 47s
bench-perf (utils/tinystr)	7m 44s
bench-perf (utils/writeable)	3m 48s
bench-perf (utils/zerovec)	9m 31s
Docs Preview	2m 49s
FFI Preview	1m 45s
Deploy to GitHub Pages	15m 46s
	3h 9m 17s

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