Add review data to the contribution statistics API

Description

The current statistics API currently returns the information about the state of contributions done as a translator. There is a need for reviewer-level contributions.
My proposed solution would involve a refactoring of the current API to return an object similar to this:

This takes into account another refactoring that was requested in a different issue (linked)

Status

Assignee

Alex Eng

Reporter

Carlos Munoz

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