Github Integration - Update board with the reviewer of a PR

We manage a Reviewer column on our boards to help us track the amount of effort each developer puts into code reviews.

Since this is done manually we keep forgetting to assign the right person as the reviewer on the Monday task.

In cases there are multiple reviewers it can either assign the first developer that reviewed the code, or the first developer that approved the PR. Could be a nice to have to choose between the two options.