Update SQLite UNIQUE inline constraint parsing to handle tabs

Update SQLite UNIQUE inline constraint parsing to handle tabs

Improvements to the regex used by the SQLite dialect to reflect the name
and contents of a UNIQUE constraint that is defined inline within a column
definition inside of a SQLite CREATE TABLE statement, accommodating for tab
characters present within the column / constraint line. Pull request
courtesy John A Stevenson.

Fixes: #11746
Closes: #11759
Pull-request: https://github.com/sqlalchemy/sqlalchemy/pull/11759
Pull-request-sha: 5752491154ad19e29abec8d69fa4076d996d964e

Change-Id: I048a90c992bfaf6857c1150f50bf3c6cc5697095
(cherry picked from commit 8071c21b5cb5009b45e8449dcb37b7c3786445e0)