Issue/gsp dno total

[peterdudfield]

Pull Request

Description

Add sum_by method to sum by 'total', 'gsp' or 'dno'

• generation - done
• forecast - done

Fixes #104 and #108

Need to first merge #118

How Has This Been Tested?

CI tests + run locally

• [ ] Yes

Checklist:

• [ ] My code follows OCF's coding style guidelines
• [ ] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Merging #119 (6fcb7cc) into main (a55d835) will increase coverage by 2.73%. Report is 7 commits behind head on main. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #119      +/-   ##
==========================================
+ Coverage   92.42%   95.16%   +2.73%     
==========================================
  Files          11       11              
  Lines         568      621      +53     
==========================================
+ Hits          525      591      +66     
+ Misses         43       30      -13     

Files Changed	Coverage Δ
pv_site_api/__init__.py	100.00% <100.00%> (ø)
pv_site_api/_db_helpers.py	99.19% <100.00%> (+14.08%)	:arrow_up:
pv_site_api/convert.py	100.00% <100.00%> (ø)
pv_site_api/main.py	93.59% <100.00%> (+0.03%)	:arrow_up:
pv_site_api/utils.py	100.00% <100.00%> (ø)

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