Support terminals in the editor area

[globalhuman]

VSCode now supports terminal creation in the editor area with the action workbench.action.createTerminalEditor. It would be great if there was a way to adopt the creation of terminals in this area.

• Create terminals in editor area
• Allow for terminals to be pinned in certain quadrants/areas of the viewer

Depending on the type of use case for multiple Terminals it is often required to have the output from multiple terminals visible at the same time. This feature would increase the screen area available rather than being constrained to the terminal panel area as suggested in #9. Both features would still be useful.