add serialization to regions for json formatted catalog

[wsavran]

• supports new region versions e.g., QuadTreeRegion
• added region comparison using to_dict method in regions

[codecov-commenter]

Codecov Report

Merging #138 (e03514f) into master (065ae2d) will increase coverage by 0.03%.
The diff coverage is 49.09%.

@@            Coverage Diff             @@
##           master     #138      +/-   ##
==========================================
+ Coverage   56.88%   56.92%   +0.03%     
==========================================
  Files          19       19              
  Lines        3157     3197      +40     
  Branches      457      468      +11     
==========================================
+ Hits         1796     1820      +24     
- Misses       1250     1258       +8     
- Partials      111      119       +8     

Impacted Files	Coverage Δ
csep/core/regions.py	52.61% <42.85%> (+0.41%)	⬆️
csep/core/forecasts.py	54.41% <50.00%> (ø)
csep/core/catalogs.py	60.18% <72.72%> (+0.18%)	⬆️

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[wsavran]

pull request is still in progress.

[pabloitu]

Its working okay with my regions. Merging

[wsavran]

nice thanks @pabloitu.