Move water use data structure to a dataclass

[timothy-nunn]

Moves the water_use_variables.py global variables into a dataclass and provides the infrastructure for managing this new way of managing data.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 93.90244% with 5 lines in your changes missing coverage. Please review.
✅ Project coverage is 47.33%. Comparing base (0f65c5e) to head (0c622f0).

Files with missing lines	Patch %	Lines
process/core/io/data_structure_dicts.py	0.00%	2 Missing ⚠️
process/core/caller.py	0.00%	1 Missing ⚠️
process/core/output.py	0.00%	1 Missing ⚠️
process/models/water_use.py	95.45%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4120      +/-   ##
==========================================
+ Coverage   47.30%   47.33%   +0.03%     
==========================================
  Files         140      141       +1     
  Lines       29448    29466      +18     
==========================================
+ Hits        13929    13947      +18     
  Misses      15519    15519              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.