Plio items in plio response

[rathorevaibhav]

Targets #232

Summary

1. Sending items data when plio is fetched. This will help to reduce a separate call to fetch plio items.

Silk query data with single plio query that also includes items:

Test Plan

• Wrote tests
• Tested locally
• Tested on staging
• Tested on production
• If changes in DB, update DB schema and BigQuery (staging and prod)

[codecov]

Codecov Report

Merging #238 (cfa8991) into master (9dad468) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #238   +/-   ##
=======================================
  Coverage   95.91%   95.91%           
=======================================
  Files         123      123           
  Lines        2399     2400    +1     
=======================================
+ Hits         2301     2302    +1     
  Misses         98       98           

Impacted Files	Coverage Δ
plio/serializers.py	97.77% <100.00%> (+0.05%)	⬆️

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