Add Vim Binding Support for CodePair Using CodeMirror 6

[hackerwins]

What would you like to be added:

In the previous version of CodePair, Vim binding was supported, which was a convenient feature for developers familiar with Vim. However, the previous version was implemented using CodeMirror 5 and used a Vim binding plugin.

With the new version of CodePair using CodeMirror 6, it would be beneficial to check if there is a Vim binding plugin available for this version as well. This will allow users who are accustomed to Vim to use the familiar key bindings in CodePair.

Why is this needed:

Adding Vim binding support will provide users with a familiar and efficient editing experience, especially for those who are comfortable with Vim. It will enhance the usability and appeal of CodePair to a wider range of developers.

Additional Information:

Additionally, we need to decide how to provide a UI for users to change editor settings, including key binding configurations.