Automated reviewer assignment

[ryanking13]

Initially I wanted to experience the process, that's why I am uploading this PR.
Please let me know if you have some concerns about the above automation process (will be implemented w/ power of AI!)

Thanks for the suggestion, but I do not want to get tons of notifications for package update PRs. For now, we have a centralized repository for recipes, but in the future (in the ideal world), each package would have separate repository with separate recipe maintainers. Then, it should be their responsibility to maintain each package.

@ryanking13, the emscripten-forge channel has a GitHub App linked to @emscripten-forge-bot. This bot is capable of merging recipes if all tests pass, linter validation is successful, and tests are present in the first place (or fail otherwise). However, I prefer not to have a completely autonomous bot due to security concerns. So, until we establish a separate repository for each package, a plausible solution would be for the bot to ping the recipe maintainers instead of us. When a contributor submits a pull request (PR) for a recipe and expresses interest in maintaining it, their name will appear in the "Review" tab with the note "recently edited these files" in future PRs intended to update that recipe.

We could have also experimented with CODEOWNERS for this, but this requires individuals to have "maintain" access to the repository.

Originally posted by @agriyakhetarpal in #318 (comment)

[ryanking13]

@leehanjeong would you be in interested working on this issue?