Fixes MSI IsisLabelNaifSpice driver and adds tests

[acpaquette]

This PR has a small center_ephemeris_time fix similar to the fix in #592 where the time was being computed slightly different to how ISIS computes the center.

This PR also adds tests for MSI and enables the driver based on the ephemeris comparison bellow:

Licensing

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This work is free and unencumbered software released into the public domain. In jurisdictions that recognize copyright laws, the author or authors of this software dedicate any and all copyright interest in the software to the public domain.

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Codecov Report

Attention: Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.

Project coverage is 15.49%. Comparing base (bc50c79) to head (7395d19).
Report is 23 commits behind head on main.

Files with missing lines	Patch %	Lines
ale/drivers/msi_drivers.py	0.00%	4 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #598      +/-   ##
==========================================
- Coverage   15.71%   15.49%   -0.23%     
==========================================
  Files          57       57              
  Lines        6326     6416      +90     
==========================================
  Hits          994      994              
- Misses       5332     5422      +90     

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