Move impact_distance to coordinates to avoid circular import

[maxnoe]

No description provided.

[codecov]

Codecov Report

Base: 92.51% // Head: 92.51% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (5de39ce) compared to base (89add5c).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #2095   +/-   ##
=======================================
  Coverage   92.51%   92.51%           
=======================================
  Files         199      200    +1     
  Lines       16561    16563    +2     
=======================================
+ Hits        15322    15324    +2     
  Misses       1239     1239           

Impacted Files	Coverage Δ
ctapipe/coordinates/__init__.py	100.00% <100.00%> (ø)
ctapipe/coordinates/impact_distance.py	100.00% <100.00%> (ø)
ctapipe/coordinates/tests/test_impact_distance.py	100.00% <100.00%> (ø)
ctapipe/coordinates/utils.py	100.00% <100.00%> (ø)
ctapipe/io/simteleventsource.py	96.05% <100.00%> (-0.02%)	⬇️
ctapipe/reco/reco_algorithms.py	100.00% <100.00%> (ø)

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