Pitch: Add bidiClass to Unicode.Scalar.Properties

Thanks to Chris Chapman (@cjchapman) for driving this! gist Add bidiClass to Unicode.Scalar.Properties Proposal: SE-NNNN Authors: Chris Chapman, Michael Ilseman Review Manager: TBD Status: Awaiting review Implementation: swiftlang/swift#91404 Review: (pitch) Introduction Unicode.Scalar.Properties exposes many of the scalar properties defined by the Unicode Standard, but not Bidi_Class, the classification that drives the Unicode Bidirectional Algorithm (UAX #9). This proposal adds a bidiClas...