Issue/metric time of day

[peterdudfield]

Pull Request

Description

add time_of_day to metric value table

Helps with https://github.com/openclimatefix/nowasting_metrics/issues/14

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-commenter]

Codecov Report

Merging #149 (32c54db) into main (57a1af5) will increase coverage by 0.00%. The diff coverage is 100.00%.

:exclamation: Current head 32c54db differs from pull request most recent head 8a55b5c. Consider uploading reports for the commit 8a55b5c to get more accurate results

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@@           Coverage Diff           @@
##             main     #149   +/-   ##
=======================================
  Coverage   95.86%   95.86%           
=======================================
  Files          21       21           
  Lines        1209     1210    +1     
=======================================
+ Hits         1159     1160    +1     
  Misses         50       50           

Impacted Files	Coverage Δ
nowcasting_datamodel/models/metric.py	96.96% <100.00%> (+0.04%)	:arrow_up:

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