Pixel Size Pass-through

[j-c-c]

Resolves #1289

Adds pixel size pass-through to ClassAvgSource and DenoisedSource. Also fixes a pixel_size bug in Simulation.

[codecov]

Codecov Report

❌ Patch coverage is 93.18182% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 90.61%. Comparing base (9210500) to head (252c28f).
⚠️ Report is 13 commits behind head on develop.

Files with missing lines	Patch %	Lines
src/aspire/basis/basis.py	92.85%	2 Missing ⚠️
src/aspire/basis/fspca.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #1290   +/-   ##
========================================
  Coverage    90.60%   90.61%           
========================================
  Files          133      133           
  Lines        14348    14373   +25     
========================================
+ Hits         13000    13024   +24     
- Misses        1348     1349    +1     

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[j-c-c]

Added pixel_size to the Coef class as discussed in meeting.

[janden]

LGTM! Sorry for the delay.