Initial MGS MOC WAC isislabelnaifspice driver (#516)

* Initial MGS MOC WA driver

* Added test data for mgsmocwa tests

* Added tests for MGS MOC WA driver

* Update mgs_drivers.py

Updated distortion coefficients for MGS MOC Wide Angle

* Added test for blue optical distortion coeffs

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Co-authored-by: Jacob Cain <115182890+jrcain-usgs@users.noreply.github.com>