add function to get latest value from forecast table

[peterdudfield]

Pull Request

Description

add new read function to get forecast value latest related to https://github.com/openclimatefix/nowcasting_api/issues/127

How Has This Been Tested?

• added a test

• normal CI tests

• [ ] Yes

If your changes affect data processing, have you plotted any changes? i.e. have you done a quick sanity check?

• [ ] 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 #104 (f59e0c7) into main (c4d7e01) will decrease coverage by 0.33%. The diff coverage is 76.92%.

@@            Coverage Diff             @@
##             main     #104      +/-   ##
==========================================
- Coverage   98.56%   98.22%   -0.34%     
==========================================
  Files          17       17              
  Lines         836      847      +11     
==========================================
+ Hits          824      832       +8     
- Misses         12       15       +3     

Impacted Files	Coverage Δ
nowcasting_datamodel/read/read.py	97.53% <72.72%> (-1.43%)	:arrow_down:
nowcasting_datamodel/__init__.py	100.00% <100.00%> (ø)
nowcasting_datamodel/update.py	98.63% <100.00%> (ø)

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