Implement Unicode Arabic Cursive Joining algorithm

[behnam]

unic-ucd-joining

Char Properties:

• Joining_Type
• Joining_Group

Refs:

• https://www.unicode.org/Public/UCD/latest/ucd/ArabicShaping.txt

unic-string-joining

To implement Unicode Arabic Cursive Joining algorithm, returning a mapping from the input characters string to list of Joining_Form values (called Glyph Type in the spec).

Refs:

• https://www.unicode.org/versions/Unicode11.0.0/ch09.pdf#page=18

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See also:

• https://github.com/open-i18n/rust-unic/issues/242