Scan rewrite

[je-cook]

Description

Closes #3928

Rewrites Scan to be more flexible for different scanning methods. Cleans up scan plotting which was 1/3 duplicated code

Checklist

I confirm that I have completed the following checks:

• My changes follow the PROCESS style guide
• I have justified any large differences in the regression tests caused by this pull request in the comments.
• I have added new tests where appropriate for the changes I have made.
• If I have had to change any existing unit or integration tests, I have justified this change in the pull request comments.
• If I have made documentation changes, I have checked they render correctly.
• I have added documentation for my change, if appropriate.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 28.47966% with 334 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.68%. Comparing base (e5c6faf) to head (49649f3).

Files with missing lines	Patch %	Lines
process/core/io/plot/scans.py	12.87%	203 Missing ⚠️
process/core/scan.py	45.66%	119 Missing ⚠️
process/core/solver/solver_handler.py	20.00%	12 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4308      +/-   ##
==========================================
+ Coverage   48.85%   49.68%   +0.82%     
==========================================
  Files         151      151              
  Lines       29469    29112     -357     
==========================================
+ Hits        14397    14464      +67     
+ Misses      15072    14648     -424     

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