Update the `Vim.deactivate` method to ensure that the cursor shape is
reset to the one available in the user's settings, in the `cursor_shape`
setting, instead of simply defaulting to `CursorShape::Bar`.

In order to test this behavior, the `Editor.cursor_shape` method was
also introduced.

Release Notes:

- Fixed the cursor shape reset in vim mode deactivation, ensuring that
the user's `cursor_shape` setting is used

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Co-authored-by: dino <dinojoaocosta@gmail.com>