Allow for different default units

[PreisTo]

- created a set_units function to manually set the units used in the analysis (must be called before creating threeML and astromodels objects)

• added Units dataclass to the config instead of hard-coding the default units

[codecov]

Codecov Report

❌ Patch coverage is 78.00687% with 64 lines in your changes missing coverage. Please review.
✅ Project coverage is 79.84%. Comparing base (3a3d9bf) to head (ba55ce6).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #239      +/-   ##
==========================================
+ Coverage   79.71%   79.84%   +0.12%     
==========================================
  Files          47       47              
  Lines        5927     6123     +196     
==========================================
+ Hits         4725     4889     +164     
- Misses       1202     1234      +32     

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[ndilalla]

@PreisTo Is this PR ready for review or still draft?

[PreisTo]

@ndilalla that's sadly still a draft - I am still going to need a couple of more days:/

[ndilalla]

@ndilalla that's sadly still a draft - I am still going to need a couple of more days:/

No worries at all! I asked because I saw that you requested my review and I wanted to make sure the PR was ready :-)