Add experiment type Viral WGS

[noctillion]

This PR include changes in experiment schema to add Viral WGS to experiment_type

[codecov]

Codecov Report

Merging #442 (48422c4) into develop (0c420d8) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff            @@
##           develop     #442   +/-   ##
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  Coverage    86.43%   86.43%           
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  Files          129      129           
  Lines         5161     5161           
  Branches       680      680           
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  Hits          4461     4461           
  Misses         520      520           
  Partials       180      180           

Files	Coverage Δ
chord_metadata_service/experiments/schemas.py	100.00% <ø> (ø)

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[davidlougheed]

we will need to also bump the version number in pyproject.toml before releasing, but this looks good to me.