add model to adjuster

[peterdudfield]

Pull Request

Description

• Add model to metric value
• add migration

Fixes #

How Has This Been Tested?

CI tests,

• [x] Yes

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [ ] I have made corresponding changes to the documentation
• [x] 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 #167 (5d72214) into main (38d505b) will increase coverage by 0.11%. The diff coverage is 93.86%.

@@            Coverage Diff             @@
##             main     #167      +/-   ##
==========================================
+ Coverage   94.85%   94.97%   +0.11%     
==========================================
  Files          23       25       +2     
  Lines        1459     1531      +72     
==========================================
+ Hits         1384     1454      +70     
- Misses         75       77       +2     

Impacted Files	Coverage Δ
nowcasting_datamodel/read/blend/utils.py	90.78% <90.78%> (ø)
nowcasting_datamodel/read/blend/blend.py	93.33% <93.33%> (ø)
nowcasting_datamodel/read/blend/weights.py	95.45% <95.45%> (ø)
nowcasting_datamodel/__init__.py	100.00% <100.00%> (ø)
nowcasting_datamodel/fake.py	100.00% <100.00%> (ø)
nowcasting_datamodel/models/metric.py	97.10% <100.00%> (+0.08%)	:arrow_up:
nowcasting_datamodel/models/models.py	100.00% <100.00%> (ø)
nowcasting_datamodel/read/read.py	98.36% <100.00%> (+0.02%)	:arrow_up:
nowcasting_datamodel/read/read_metric.py	100.00% <100.00%> (ø)
nowcasting_datamodel/save/adjust.py	97.56% <100.00%> (+0.06%)	:arrow_up:

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