Imaging Convenience Tools

[DanRyanIrish]

This PR proposes some convenience tools for condensing a some common tasks that are mostly well-defined but currently take many lines of code.

[DanRyanIrish]

@samaloney Would something like this be within scope for STIXpy?

[samaloney]

This is a transform like any other so we should do it via the standard API can include this shortcut in the transformation code I think - need to think about this a bit more.

[DanRyanIrish]

OK, I think that makes sense.

[codecov]

Codecov Report

Attention: Patch coverage is 23.88060% with 51 lines in your changes missing coverage. Please review.

Project coverage is 71.96%. Comparing base (5dbfc0b) to head (7f57d78).

Files with missing lines	Patch %	Lines
stixpy/imaging/tools.py	22.41%	45 Missing ⚠️
stixpy/map/stix.py	33.33%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
- Coverage   73.56%   71.96%   -1.60%     
==========================================
  Files          32       33       +1     
  Lines        2016     2083      +67     
==========================================
+ Hits         1483     1499      +16     
- Misses        533      584      +51     

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