- Update `vim::normal::Vim.normal_replace` to work with more than one
  character
- Add `vim::replace::Vim.paste_replace` to handle pasting the 
  clipboard's contents while in replace mode
- Update vim's handling of the `editor::actions::Paste` action so that
  the `paste_replace` method is called when vim is in replace mode,
  otherwise it'll just call the regular `editor::Editor.paste` method

Closes #41378 

Release Notes:

- Improved pasting while in Vim's Replace mode, ensuring that the Zed
replaces the same number of characters as the length of the contents
being pasted