Changed evt/spms to allow for event building with zero-suppression data

[rosannadeckert]

• Fixed bug in hit/build_hit.py
• Changed functions in evt/spms.py to account for data in zero-suppression mode, i.e. when each event has a different number of channels that triggered

[codecov]

Codecov Report

Attention: Patch coverage is 8.33333% with 11 lines in your changes missing coverage. Please review.

Project coverage is 48.63%. Comparing base (29d9b63) to head (bc3dbbb).
Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/pygama/evt/modules/spms.py	0.00%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #597      +/-   ##
==========================================
- Coverage   48.68%   48.63%   -0.05%     
==========================================
  Files          60       60              
  Lines        7939     7947       +8     
==========================================
  Hits         3865     3865              
- Misses       4074     4082       +8     

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