Clipper Push Broom camera model and tests. (#4564)

* Clipper Push Broom camera model and tests.

* Added detector map and added fixture.

* Wac implemented in pushbroom camera + test.

* Added new test cube to push broom fixture. Addressed PR feedback.

* minor correction.

* Reverted LineScanCameraGroundMap changes.

* Modified fixture for Nac/Wac cubes. Updated ik codes per PR comment.