add start and end times on forecast and generation

[peterdudfield]

Pull Request

Description

add start and end filters for generations and forecasts

This one first #119

Fixes #110

How Has This Been Tested?

CI tests

• 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]

Codecov Report

Merging #120 (5a016e8) into main (a55d835) will increase coverage by 2.85%.
Report is 7 commits behind head on main.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #120      +/-   ##
==========================================
+ Coverage   92.42%   95.28%   +2.85%     
==========================================
  Files          11       11              
  Lines         568      636      +68     
==========================================
+ Hits          525      606      +81     
+ Misses         43       30      -13     

Files Changed	Coverage Δ
pv_site_api/__init__.py	100.00% <100.00%> (ø)
pv_site_api/_db_helpers.py	99.21% <100.00%> (+14.11%)	⬆️
pv_site_api/convert.py	100.00% <100.00%> (ø)
pv_site_api/main.py	93.92% <100.00%> (+0.36%)	⬆️
pv_site_api/utils.py	100.00% <100.00%> (ø)

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[zakwatts]

LGTM