* Adds a new right-click menu item to view imagery tools. Adds a new view provider and scaffolding for a new view to hold the tool

* Markup and CSS for Imagery Measuring Tool

- New .scss file measuring-tool.scss.
- Markup added and smoke-tested.
- Added new property called `isScaling` that controls verbiage contextually:
 - false if the user is measuring rover to point A.
 - true if the user measuring point A to B
- Minor refinement to CSS for Notebook.

* Markup and CSS for Imagery Measuring Tool

- New markup

* Remove viper specific code

* Refactored view context object. Emit event when related telemetry is available

* Tweak colors

* Expose spacecraft Z

* Fixed failing tests

* Fix lint error

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Co-authored-by: Charles Hacskaylo <charlesh88@gmail.com>
Co-authored-by: Andrew Henry <andrew.k.henry@nasa.gov>
Co-authored-by: Andrew Henry <akhenry@gmail.com>