Rename constants source to forcings

[sandorkertesz]

No description provided.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 95.91837% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.92%. Comparing base (721fe99) to head (b7cd8d5).

Files	Patch %	Lines
tests/forcings/test_forcings_proc.py	87.50%	1 Missing ⚠️
tests/forcings/test_forcings_slice.py	92.30%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #408   +/-   ##
========================================
  Coverage    89.92%   89.92%           
========================================
  Files          120      120           
  Lines         7764     7764           
  Branches       675      675           
========================================
  Hits          6982     6982           
  Misses         651      651           
  Partials       131      131           

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