Make extract_stars recognize different conventions for x/y positions

I am using the ``DAOStarFinder`` to find stars and would like to use this table directly in ``extract_stars`` - it would be nice to be able to do this without having to recreate a new table or rename the columns to ``x``/``y``. Could ``extract_stars`` include some heuristics to recognize e.g. ``xcentroid``/``ycentroid``, as well as ``xcenter``/``ycenter`` and ``x_peak``/``y_peak``, which are all conventions used in photutils?

Start by locating the extract_stars implementation and its tests, then inspect how DAOStarFinder exposes xcentroid/ycentroid. The change is done when extract_stars accepts xcentroid/ycentroid, xcenter/ycenter, and x_peak/y_peak conventions without requiring callers to recreate or rename the table, with tests covering these inputs.

Written by the indexing model from the issue text.