Add option `{"vim.mouseSelectionMovesCursor": false}`

Is your feature request related to a problem? Please describe.
When using cli vim with set mouse= clicking and selecting does NOT change mode or move the cursor. This allows you the be in the middle of insert typing and then mouse-select, cmd-C, cmd-V to copy-paste into your current cursor location. That is to say, the mouse cursor and the terminal/text cursor are totally separate. It makes it VERY difficult for people who have used vim for 20+ years to learn to use VSCode.

Describe the solution you'd like
Please add an option to make mouse selections (click-drag, double-click, triple-click) not move the text cursor. I'd call it {"vim.mouseSelectionMovesCursor": false}.When combined with {"vim.mouseSelectionGoesIntoVisualMode": false} this would give an experience that is consistent enough with terminal. You could add an option for {"vim.mouseClickMovesCursor": false} and then it would be totally consistent with the terminal. But, I don't need that feature myself.

Describe alternatives you've considered
I'd be willing to try my hand at contributing to this feature. But, I've never done anything with VSCode development. I'd need a lot of guidance, and I'm not so sure that addressing selections and cursors separately is going to be possible with the incumbent/inherent API/model

Start by examining the existing vim.mouseSelectionGoesIntoVisualMode option and how VS Code models selections and the text cursor. Determine whether click-drag, double-click, and triple-click selections can avoid moving the cursor independently. Done means the proposed mouseSelectionMovesCursor setting works without breaking the existing visual-mode option.