add end datetime filters

[peterdudfield]

Pull Request

Description

add end datetime filters

Helps with https://github.com/openclimatefix/uk-pv-national-gsp-api/issues/269

How Has This Been Tested?

• CI tests

• added to 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[bot]]

Codecov Report

Merging #238 (0f0ef55) into main (aae5bd3) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #238   +/-   ##
=======================================
  Coverage   95.22%   95.23%           
=======================================
  Files          27       27           
  Lines        1719     1721    +2     
=======================================
+ Hits         1637     1639    +2     
  Misses         82       82           

Files Changed	Coverage Δ
nowcasting_datamodel/read/read.py	98.05% <100.00%> (+0.01%)	:arrow_up:

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