Add Pull Requests Reviewed column to statistics

[kfrz]

Background

This is an epic that will track the work required to add Pull Requests Reviewed. Originally from this conversation

• Add column to statistic for reviewers
  • Identical structure and implementation as the assignees column
• Git hub service endpoint
• Git hub persist class and updateorcreate class to save to the db
  • Exclude the author
• BE graphql
  • Add an ownership type of "reviewer"
    □ StatisticOwnershipEnumType
  • Update the statistics query rb resolver and specs
• Have to query it from the FE
  • Add a Statistics collection in statistics js
  • Graphql Query in statistics queries js
• This new feature will need to be added to the "Week in Review submittal" page and process, as well (this work needs to be broken out into individual tickets)