Reprex extension

First of all thanks for the package! In best traditions of R, we need to enable rendering of reprex output to Teams (similar how it is done in [slackreprex](https://yonicd.github.io/slackreprex/)).

Start by reading the repository's existing Teams-related API entry points and the linked slackreprex behavior to determine how reprex output should be represented. Done means R reprex output can be rendered to Microsoft Teams with behavior comparable to slackreprex; the issue does not name specific files or tests.

Written by the indexing model from the issue text.