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 79.53020% with 61 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.04%. Comparing base (ec6d6cf) to head (c767f95).
⚠️ Report is 2 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #239      +/-   ##
==========================================
+ Coverage   79.79%   80.04%   +0.25%     
==========================================
  Files          47       47              
  Lines        5958     6149     +191     
==========================================
+ Hits         4754     4922     +168     
- Misses       1204     1227      +23     

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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 :-)

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