Issue/metrics forecast horizon

[peterdudfield]

Pull Request

Description

add forecast_horizon_minutes to MetricVale

Fixes #

How Has This Been Tested?

covered in 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 #105 (688651b) into main (0b9bd7e) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #105   +/-   ##
=======================================
  Coverage   98.19%   98.19%           
=======================================
  Files          19       19           
  Lines         941      943    +2     
=======================================
+ Hits          924      926    +2     
  Misses         17       17           

Impacted Files	Coverage Δ
nowcasting_datamodel/models/metric.py	96.92% <100.00%> (+0.09%)	:arrow_up:

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