babelfish-for-postgresql / babelfish_extensions / 10389490935

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fix infinite loop in replace with AI collations (#2849)

ICU usearch_next() goes into infinite loop when pattern to search starts with a surrogate pair.
To get around this we check if output of usearch_next() is stuck and not proceeding forwards
and set the offset for next search ourselves.
The next offset is simply the next character after the current char in source string.

SRC STRING - 'abc🙂defghi🙂🙂'    PATTERN TO FIND = '🙂def'

usearch_next() gets stuck on "🙂" idx = 3 and repeatedly returns this index.
We will intervene and set the offset to "d" idx = 4. 
So that usearch_next only starts looking from this character.

Taks: BABEL-5167
Signed-off-by: Tanzeel Khan <tzlkhan@amazon.com>

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