Improve CLI for flint_masking

[tjgalvin]

Some interest has been received around using some of the masking operations for use via a cli. Upon inspection it was pretty clear the cli was out of date and fairly primitive.

This change improves the CLI, and marks an early version of the minimum box car artifact masker as deprecated and to be removed.

A separate erosion mode based on the shape of the restoring beam has also been added.

Some other bits of dead code has been removed, and some light reordering of the internals / keyword parameters.

Tests have been added for some of the new features, and some have been modified in anticipation of removing the older minimum box car artifact masker.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 92.40506% with 6 lines in your changes missing coverage. Please review.

Project coverage is 60.32%. Comparing base (ddc2686) to head (a5b8161).

Files with missing lines	Patch %	Lines
flint/masking.py	92.40%	6 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #178      +/-   ##
==========================================
+ Coverage   59.79%   60.32%   +0.53%     
==========================================
  Files          33       33              
  Lines        5686     5727      +41     
==========================================
+ Hits         3400     3455      +55     
+ Misses       2286     2272      -14     

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