Cross talk correction code for `build_evt()`

[tdixon97]

This contains code to cross talk correct the energies inside the evt tier. The underlying operations are performed in the evt/modules/cross_talk.py module acting on awkward arrays. The correction is applied recursively in a simple way to GERDA.

• [x] basic implementation
• [x] unit tests
• [x] handling of logic of negative pulses (arbitary)
• [x] positive polarity cross talk
• [x] format energies to allow matrix solution
• [x] fast (matrix algebra) implementation
• [x] function to compute multiplicity

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 47.84946% with 97 lines in your changes are missing coverage. Please review.

Project coverage is 50.09%. Comparing base (daa9530) to head (18c32c3). Report is 17 commits behind head on main.

Files	Patch %	Lines
src/pygama/evt/modules/xtalk.py	62.28%	43 Missing :warning:
src/pygama/evt/modules/geds.py	0.00%	28 Missing :warning:
src/pygama/hit/build_hit.py	7.14%	26 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #572 +/- ## ========================================== + Coverage 50.05% 50.09% +0.03% ========================================== Files 63 59 -4 Lines 7581 7749 +168 ========================================== + Hits 3795 3882 +87 - Misses 3786 3867 +81 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.