gitmate_reviewer: Add reviewer plugin

Sanchit Guptarequested to merge
pilgrim2308/gitmate-2:review-plugin into master

Auto label and approver plugin have been merged into a combined reviewer plugin. It applies exactly one of the wip, pending review, and approved label.

Closes coala/GSoC/gsoc-2021#25 (closed).

Edited by Sanchit Gupta

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