Enter visual mode whenever a selection is made

[henrikrudstrom]

Is your feature request related to a problem? Please describe.
sometimes i make selections using the keyboard that are not the result of using any vim command (for example arrow keys + shift, smartSelect.grow). when i make these selections vscodevim does not enter visual mode like it does when you select using the mouse. This is annoying because now i cannot use 'y' to yank or 'd' to delete.

Describe the solution you'd like
Whenever there is a selection in the editor vim should be in visual mode.
Not sure what would be the best behaviour when a selection is made in insert mode, but to me it still seems most consistent to switch to visual mode as well.

[J-Fields]

Duplicate of #1806