[DRAFT] Display progress in pane

[PankajBhojwani]

Summary of the Pull Request

Currently, a very initial implementation of showing progress in the pane. When we receive the OSC sequence to update the taskbar progress, we also update the pane's progress bar

Bunch of TODOs left:

• Add a setting to disable this
• Add settings for size/location/etc of the progress bar
• Improve the error and paused states (perhaps with a different style?) The current error state is no different from a progress = 0 state and the paused state is barely noticeable compared to a normal state

References

#6700

PR Checklist

• Closes #xxx
• CLA signed. If not, go over here and sign the CLA
• Tests added/passed
• Documentation updated. If checked, please file a pull request on our docs repo and link it here: #xxx
• Schema updated.
• I work here

Validation Steps Performed

Progress bar updates with the appropriate OSC sequences