New unicode aware string module that works with unicode:chardata()

Works with unicode:chardata() as input as was decided on OTP board
meeting as response to EEP-35 a long time ago.

Works on graphemes clusters as base, with a few exceptions, does not
handle classic (nor nfd'ified) Hangul nor the extended grapheme
clusters such as the prepend class. That would make handling binaries
as input/output very slow.

List input => list output, binary input => binary output and
mixed input => mixed output for all find/split functions.
So that results can be post-processed without the need to invoke
unicode:characters_to_list|binary for intermediate data.

pad functions return lists of unicode:chardata() for performance.

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