Feature: Emoji reaction

[adrianjost]

First of all: Thanks you for developing this awesome action! It helped me a lot.

I would like to request the feature, that you can react with an emoji to the comment instead of just having an option to label the PR.
The Dependabot Bot does this, when you trigger it using a PR Comment, and https://github.com/Khan/pull-request-comment-trigger also supports it.

[SavvasArifMukhthar]

+1