[task #14639] Table arithmetic operator to find rows within given region

[Sachin Kumar Singh]

Follow-up Comment #15, task #14639 (project gnuastro):

Pushed new changes here
<https://github.com/sachinkumarsingh092/gnuastro/tree/task-table-inpolygon>.
As the ID column was required to be stored in the output, I made use of a
third column. Then used a temporary array as the number of rows would be
unknown until they are passed through `gal_polygon_is_inside`. Printing the
values of column showed the right output.

The only problem is that if I use the `outsize` as the size in allocation, it
conflicts with the `mask` in `table_selection` in size. If I use
`p->table->dsize` the value is too large to be allocated. The error was there
before I decided to use a third column so it is a cause if it. Where is the
size going wrong?

Also, this is just a temporary commit fo review. I'll remove it in rebase and
hence have not properly followed all the convection. Please ignore any stray
whitespace or indentation. I'll fix it before rebasing:)

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