Is your feature request related to a problem? Please describe.
In Vim the ex command :range c (e.g. :1,14c) changes lines in the specified range, deleting them and entering insert mode.
VSCodeVim supports :range for commands like delete (:d) and yank (:y) but not change (:c), so users can't perform multiline changes in ex mode. This is a missing core feature.

Describe the solution you'd like
Implementation of full support for :range c in ex command mode

• Accept range syntax (:1,14c, %c,:.,.+c, etc).
• Delete the lines in the specified range
• Place the cursor at the start of the first line in the range
• Enter insert mode
• Ensure undo (u) is possible after changes are made

Describe alternatives you've considered

• Manually selecting lines and using c in normal mode (works but is slow and inefficient for large ranges)
• Using :range d followed by i (works but could be more efficient since it requires two separate steps)

Additional context

• The command is a standard part of Vim's ex command set and improves similarity
• The implementation could likely reuse the :range d logic and add a transition into insert mode at the end

Note: I’m happy to take this on and submit a PR if I have the go ahead