improve reflection of inline UNIQUE constraints

improve reflection of inline UNIQUE constraints

Fixed issue where SQLite unique constraint reflection would not work
for an inline UNIQUE constraint where the column name had an underscore
in its name.

Added support for reflecting SQLite inline unique constraints where
the column names are formatted with SQLite "escape quotes" ``[]``
or `` ` ``, which are discarded by the database when producing the
column name.

Fixes: #7736
Change-Id: I635003478dc27193995f7d7a6448f9333a498706
(cherry picked from commit 834af17a469fd1893acf20225e8400c0c908053f)