Calculate RMS of inner region during validation plot

[tjgalvin]

When putting a field through the validation plot and table creating a median RMS is computed from the entire RMS computed by bane, which includes the increased in noise towards the edge field as a result of the higher attenuation of the primary beam.

This introduces a change to extract a set of pixels from the inner region of the RMS image when computing the RMSImageInfo structure to avoid this roll off.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 56.54%. Comparing base (547015f) to head (bad33b5).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #166      +/-   ##
==========================================
+ Coverage   56.41%   56.54%   +0.12%     
==========================================
  Files          33       33              
  Lines        5119     5134      +15     
==========================================
+ Hits         2888     2903      +15     
  Misses       2231     2231              

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