Updated feasible_point to search over scan points

[j-a-foster]

Description

Updates create.py to allow creating new IN.DATs from any point in a scan.

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 0% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 49.89%. Comparing base (a9358cc) to head (c18a291).
⚠️ Report is 25 commits behind head on main.

Files with missing lines	Patch %	Lines
process/core/io/in_dat/create.py	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4552      +/-   ##
==========================================
+ Coverage   49.46%   49.89%   +0.43%     
==========================================
  Files         150      151       +1     
  Lines       30069    29863     -206     
==========================================
+ Hits        14874    14901      +27     
+ Misses      15195    14962     -233     

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[timothy-nunn]

Thanks Jack, this all works well