Allow hiding column numbers in live_grep picker

[Imberflur]

Is your feature request related to a problem? Please describe.
When using live_grep the column numbers can sometimes be unnecessary visual clutter for me. However, as far as I've been able to find the only option available for toggling them off is disable_coordinates which also removes line numbers.

I might just be missing something though! I've just started trying out telescope.

Describe the solution you'd like
A way to configure just column numbers to be disabled.

Describe alternatives you've considered
Maybe there would be some way to allow the user to provide a custom function that performs the formatting of line/column numbers? Similar to the path_display option?

[Imberflur]

I managed to hack in a disable_column here Imberflur@b370779 but I don't know if this approach is ideal since this then has some overlap with the functionality of disable_coordinates.

[Imberflur]

Hi! I just realized I'm still using this. If there is interest, I would be willing to work on making this ready for a PR.

[jamestrew]

This PR will consolidate a lot of the logic of displaying filepaths and lnum/cols for any picker that displays these #3200

I would at least wait until that is merged and then we can revisit this.