Include role in owners api response

[jakebills1]

Addresses #5816 by including the role of each member of a gem in the response to /api/v1/gems/:gem_id/owners.json

Note: There could be a better solution to this, but I found it difficult to work around the User#payload method. It looks like using serializers was discussed in the past but rejected. #1027 (comment) As this is my first PR here, I am absolutely open to feedback or better approaches.

[simi]

Hello, you're right there is no pattern established to compose payload so it is in-lined usually.

rubygems.org/app/controllers/api/v1/activities_controller.rb

Lines 14 to 17 in 9bcbf60

	def render_rubygems(versions)
	rubygems = versions.includes(:dependencies, :gem_download, rubygem: %i[linkset gem_download]).map do |version|
	version.rubygem.payload(version)
	end

rubygems.org/app/controllers/api/v2/contents_controller.rb

Lines 30 to 34 in 9bcbf60

	def checksums_payload(checksums_file)
	ShasumFormat.parse(checksums_file).transform_values do |checksum|
	{ VersionManifest::DEFAULT_DIGEST => checksum }
	end
	end

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.44%. Comparing base (874ec61) to head (db4d209).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5821      +/-   ##
==========================================
- Coverage   97.19%   94.44%   -2.76%     
==========================================
  Files         471      471              
  Lines        9691     9753      +62     
==========================================
- Hits         9419     9211     -208     
- Misses        272      542     +270     

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[simi]

Would be good to make this more SQL effective. Now it seems to trigger additional query per each owner.

[jakebills1]

Thanks @simi
I believe my latest commit reduces it back down to one query