Keep WordUtils.wrap from splitting a surrogate pair

[alhudz]

Repro: WordUtils.wrap("a😀😀😀😀", 4, "\n", true), four U+1F600 after a leading a.
Cause: with wrapLongWords set, a word longer than the column is hard-broken at the fixed char offset wrapLength + offset and the new-line is inserted there. When that offset lands between the high and low surrogate of a supplementary code point the pair is split, so a lossless wrap emits a lone high surrogate at the end of one line and a lone low surrogate at the start of the next.
Fix: nudge the break one char forward when it would land inside a pair, keeping the whole code point on the current line. BMP input and the delimiter-based wrap paths are unaffected.

[garydgregory]

Merged, TY @alhudz, please port to Apache Commons Text.

[alhudz]

Ported in apache/commons-text#755 - same fix, the wrap test fails on the current Text tree without it.