Render and reflect MySQL WITH PARSER index options

Render and reflect MySQL WITH PARSER index options

Support added for the "WITH PARSER" syntax of CREATE FULLTEXT INDEX
in MySQL, using the ``mysql_with_parser`` keyword argument.  Reflection
is also supported, which accommodates MySQL's special comment format
for reporting on this option as well.  Additionally, the "FULLTEXT" and
"SPATIAL" index prefixes are now reflected back into the ``mysql_prefix``
index option.

Change-Id: I0209291978125d8cee1bb5ed386d4f66578697a0
Fixes: #4219