data_sources -> data_tables & source -> data

[brynpickering]

Fixes #673

Reviewer checklist

• Test(s) added to cover contribution
• Documentation updated
• Changelog updated
• Coverage maintained or improved

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.98%. Comparing base (683a5b7) to head (a512239).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #688   +/-   ##
=======================================
  Coverage   95.98%   95.98%           
=======================================
  Files          26       26           
  Lines        3981     3981           
  Branches      837      768   -69     
=======================================
  Hits         3821     3821           
  Misses         70       70           
  Partials       90       90           

Files with missing lines	Coverage Δ
src/calliope/model.py	96.29% <100.00%> (ø)
src/calliope/preprocess/data_tables.py	100.00% <100.00%> (ø)
src/calliope/preprocess/model_data.py	100.00% <100.00%> (ø)
src/calliope/util/schema.py	94.66% <100.00%> (ø)

[irm-codebase]

Pretty simple refactoring. Approved!

Stuffy checked:

• Checked the documentation/code for references to data_source
• Checked the renamed classes / variables / functions.