Feature extension

[Imiss-U1025]

Proposed changes

Implemented Tree View in extensions of right panel.

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• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation Update (if none of the other choices apply)

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• Lint and unit tests pass locally with my changes
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[FalkWolsky]

Thank you very very much for this super helpful contribution! This makes the life of many users really easier!