Modification to WaveformContainer and ChargeContainer for SPE-WT

[sona-patel]

This PR modifies the WaveformContainer and ChargeContainer (mainly load_wfs and write function) to read and store waveform given the list of event_id for splitting.

[jlenain]

Thanks, @sona-patel !
Is this PR still in the draft stage ? The title seems to indicate so.

[jlenain]

Thanks for this, @sona-patel . I think the class behaviors should default to loading/writing whole runs. In such a case, default values should be provided in the loading/writing methods.

[sona-patel]

Thanks, @sona-patel ! Is this PR still in the draft stage ? The title seems to indicate so.

Thanks for reviewing @jlenain!
Yes, I kept it as a draft, since I also want to add the user_scripts using this case. What do you suggest? Should I put it along with this PR or in a separate PR?

[codecov]

Codecov Report

Attention: 367 lines in your changes are missing coverage. Please review.

Comparison is base (39b677b) 5.61% compared to head (a468baf) 5.59%.
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##           master     #79      +/-   ##
=========================================
- Coverage    5.61%   5.59%   -0.03%     
=========================================
  Files          37      37              
  Lines        3667    3681      +14     
=========================================
  Hits          206     206              
- Misses       3461    3475      +14     

Files	Coverage Δ
src/nectarchain/calibration/container/charge.py	0.00% <0.00%> (ø)
src/nectarchain/calibration/container/waveforms.py	0.00% <0.00%> (ø)

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