Create samples with packet energies

[Knights-Templars]

📝 Description

Type: 🚀 feature | 🎢 infrastructure

Create an array with packet energies sampled randomly from the decay data frame.

🚦 Testing

How did you test these changes?

• Testing coming soon.

☑️ Checklist

• I requested two reviewers for this pull request

[codecov]

Codecov Report

Attention: Patch coverage is 33.33333% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 67.49%. Comparing base (763f571) to head (e4f680a).
Report is 3 commits behind head on master.

Files	Patch %	Lines
tardis/energy_input/gamma_ray_channel.py	33.33%	6 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2572      +/-   ##
==========================================
- Coverage   67.51%   67.49%   -0.03%     
==========================================
  Files         170      170              
  Lines       14230    14237       +7     
==========================================
+ Hits         9608     9609       +1     
- Misses       4622     4628       +6     

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[Knights-Templars]

Sampling will be made in the PacketSource.