Send alignment quality of tomograms plus tilt angle step to frontend

[stephen-riggs]

Summary:

Allow the alignment quality to be displayed in the tomogram alignment frontend display, and also send the pixel size in nm and the angle step between tilts.

Changes:

• Add alignment quality to tomogram response model
• Add method to store pixel size in nm as well as Angstroms
• Add method to find the tilt angle step

To test:

• Needs frontend on branch feature/b24-page
• Go to https://local-oidc-test.diamond.ac.uk:9000/proposals/bi40959/sessions/38/groups/18815831/tomograms/1 and check global alignment quality is displayed in the alignment table, and that the pixel size and angle step are displayed in the collection parameters table

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.84%. Comparing base (961df92) to head (8ce2ff2).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #26      +/-   ##
==========================================
+ Coverage   94.81%   94.84%   +0.03%     
==========================================
  Files          46       46              
  Lines        1908     1920      +12     
==========================================
+ Hits         1809     1821      +12     
  Misses         99       99              

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[gfrn]

I believe this could be rewritten as a computed field instead

https://pydantic.dev/docs/validation/2.3/usage/computed_fields/