Enhancement: Add option to calculator plugin to disable spaces in numbers

**Is your feature request related to a problem? Please describe.**

I use the calculator a lot but some softwares I use don't like the spaces between digits making it really frustrating. I have to remove all spaces each time I copy the result.

**Describe the solution you'd like**

Add an option in the plugin settings to change the result output format.

**Additional context**

It is extra annoying when pasting in code editors like rider :

Locate the calculator plugin and its plugin settings, then trace where calculator results are formatted. Add a setting that controls whether digit-grouping spaces appear, and verify that copied results follow the selected format.

Written by the indexing model from the issue text.