add special rule to honor UPPERCASE name for TExtualSelect

add special rule to honor UPPERCASE name for TExtualSelect

Fixed issue in name normalization (e.g. "uppercase" backends like Oracle)
where using a :class:`.TextualSelect` would not properly maintain as
uppercase column names that were quoted as uppercase, even though
the :class:`.TextualSelect` includes a :class:`.Column` that explicitly
holds this uppercase name.

Fixes: #10788
Change-Id: I542a2313d22cf13db6760fe02ac659c97b5aa29e