Add "matches regex" to column filter options

When selecting a column filter, it's often useful to be able to use the regular expression operators ~ and ~* to filter by a regex - I use this daily. Would love to see this in this list!

"matches regex (ci)" for a case insensitive version would be helpful as well, though that's perhaps not as self-documenting, and "(case-insensitive)" might be too long. But even just the standard "matches regex" would be tremendously valuable.

https://postgresql.org/docs/18/interactive/functions-matching.html#FUNCTIONS-POSIX-REGEXP

Thanks!

Start by locating the column filter options entry point and the PostgreSQL filter translation used by Postico. Add a visible “matches regex” option backed by the ~ operator, then verify that selecting it filters column values by a regular expression.

Written by the indexing model from the issue text.