Create multiple clearsky endpoint

[ericcccsliu]

Pull Request

Description

For our UI, we occasionally need to get multiple clearsky forecasts at once. This pull request adds an endpoint to get clearsky estimates over many sites, which also brings the clearsky endpoints in line with the endpoints for forecasts and actuals

How Has This Been Tested?

• [x] Added tests
• [x] Performed a sanity check with outputted data

The data processing shouldn't be changed at all—doing the same processing, just with multiple sites

Checklist:

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

[codecov[bot]]

Codecov Report

Merging #84 (5eecace) into main (d8ee3ef) will increase coverage by 0.87%. The diff coverage is 95.58%.

@@            Coverage Diff             @@
##             main      #84      +/-   ##
==========================================
+ Coverage   92.95%   93.82%   +0.87%     
==========================================
  Files           9       10       +1     
  Lines         369      405      +36     
==========================================
+ Hits          343      380      +37     
+ Misses         26       25       -1     

Impacted Files	Coverage Δ
pv_site_api/session.py	37.50% <0.00%> (ø)
pv_site_api/auth.py	90.47% <90.47%> (ø)
pv_site_api/__init__.py	100.00% <100.00%> (ø)
pv_site_api/_db_helpers.py	100.00% <100.00%> (ø)
pv_site_api/cache.py	97.14% <100.00%> (ø)
pv_site_api/main.py	92.85% <100.00%> (+2.41%)	:arrow_up:

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[ericcccsliu]

For some reason, a check regarding the forecast is failing (length of forecast values is 17 instead of 20) and I can't seem to figure out why

[peterdudfield]

@simlmx would you mind deploying this?