Add value field to classifications type

[cesarvarela]

Adds a new value field to the classification type that handles mulitple types (arrays, strings, number, etc.)

https://pr-3616--staging-aiid.netlify.app/api/graphql?explorerURLState=N4IgJg9gxgrgtgUwHYBcQC4TADpIAR5QA2AhgM5kCWAZpVCSpRPjvgXgygE6UBGMKBGTyt27MgAsIXFAH0kJRLjEEAbiSIwEy9gF8d%2BpLpC6gA

[codecov]

Codecov Report

❌ Patch coverage is 70.12987% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 91.49%. Comparing base (ded1d7d) to head (d60dc9e).
⚠️ Report is 108 commits behind head on staging.

Files with missing lines	Patch %	Lines
site/gatsby-site/server/scalars.ts	40.00%	21 Missing ⚠️
site/gatsby-site/server/types/classification.ts	86.66%	2 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           staging    #3616      +/-   ##
===========================================
- Coverage    91.65%   91.49%   -0.16%     
===========================================
  Files           83       83              
  Lines        10746    10818      +72     
  Branches       510      513       +3     
===========================================
+ Hits          9849     9898      +49     
- Misses         897      902       +5     
- Partials         0       18      +18     

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