unicode-org / icu4x / 13506944341

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Add all missing properties FFI APIs (#6177)

Part of #6169


Adds:

- `rust_link` for to/from ICU4X APIs. Rename them a bit. I am _not_
renaming them to have icu4c in their name because in the context of
ICU4X FFI the property integers are not just useful for ICU4X: they're
useful for CodePointMapData (which does not return typed values)
- `for_char` convenience APIs over FFI, providing a no-alloc way to get
properties
- `long_name` and `short_name` APIs, only in compiled data mode. We can
add a separate data loading path if requested
- Bidi convenience properties, only in compiled data mode. We can add a
separate data path if requested, again.


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