Add capacity pv system

[peterdudfield]

Pull Request

Description

• add installed capacity on pv system,
• added migrations and ran on database

Fixes # https://github.com/openclimatefix/nowcasting_forecast/issues/97

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• [ ] 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-commenter]

Codecov Report

Merging #52 (ec45fb2) into main (a2e8254) will increase coverage by 0.01%. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #52      +/-   ##
==========================================
+ Coverage   98.43%   98.44%   +0.01%     
==========================================
  Files          16       16              
  Lines         640      645       +5     
==========================================
+ Hits          630      635       +5     
  Misses         10       10              

Impacted Files	Coverage Δ
nowcasting_datamodel/__init__.py	100.00% <100.00%> (ø)
nowcasting_datamodel/connection.py	94.11% <100.00%> (+0.36%)	:arrow_up:
nowcasting_datamodel/models/pv.py	100.00% <100.00%> (ø)
nowcasting_datamodel/read/read.py	99.28% <100.00%> (+0.01%)	:arrow_up:

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