make adjuster optional

[dfulu]

Pull Request

Make applying the adjuster optional

Checklist:

• [x] My code follows OCF's coding style guidelines
• [x] I have performed a self-review of my own code
• [x] I have made corresponding changes to the documentation
• [x] I have added tests that prove my fix is effective or that my feature works
• [x] I have checked my code and corrected any misspellings

[codecov[bot]]

Codecov Report

Merging #182 (0bbc01a) into main (ac394e1) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main     #182   +/-   ##
=======================================
  Coverage   94.91%   94.91%           
=======================================
  Files          27       27           
  Lines        1592     1593    +1     
=======================================
+ Hits         1511     1512    +1     
  Misses         81       81           

Impacted Files	Coverage Δ
nowcasting_datamodel/save/save.py	100.00% <100.00%> (ø)

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[peterdudfield]

@all-contributors please add @dfulu for code

[allcontributors[bot]]

@peterdudfield

I've put up a pull request to add @dfulu! :tada: