Table.read FITS connector should accept more fits.open arguments #3958

In the effort to converge on end-to-end Table support for FITS files, we often try to get users to use Table.read to read FITS tables as much as possible. However, sometimes it is useful/necessary to use some of the lower-level fits.open arguments when opening a FITS table, such as the uint=True argument (although that is at least now the default as of #3916) and the memmap option.
These should be supported as optional **kwargs to Table.read() to be recognized by the FITS connector when reading FITS files.