Add "Open in Opposite Group" Feature to Improve Editor Navigation

[sfyr111]

Description

The "Open in Opposite Group" feature allows users to quickly open the currently active editor tab in the opposite editor group, which can significantly enhance navigation efficiency when working with multiple files. This feature aims to mimic the convenience found in IntelliJ IDEA, providing a similar user experience for VSCode users.

Expected Behavior

• When triggered, the currently active file should open in the opposite editor group. If the file is in the first group, it should open in the second, and vice versa.
• The focus should move to the newly opened editor tab, allowing immediate interaction.
• Triggering the command again should toggle the view back to the original editor group, maintaining focus on the file.

Current Behavior

• Currently, VSCode does not offer a built-in command to quickly toggle the active editor between groups while maintaining focus.

Possible Solution

• Implement a new command intellij.openInOppositeGroup that handles the opening of the active editor in the opposite group and manages focus accordingly.

This feature would be a valuable addition for users who frequently work with multiple files and editor groups, enhancing their workflow and productivity.

[kasecato]

@sfyr111 I just released it as v1.6.1