Filter based on issue type

[Bibo-Joshi]

Description:
Introduce a parameter only-issue-types that ensures that only issues of a specific type are set to stale and closed.

Justification:
With the introduction of types, GitHub as given organizations a new issue attribute that can be used for categorization/classification of issues. For different issue types it would be desirable to have different stale settings just like we currently can have for labels. E.g. in my organization, we'll be using the new issue type for separating questions from feature requests. Questions should go stale faster.

Are you willing to submit a PR?
I'm open to try so, but will need some pointers, especially on testing. I'm not familia with TypeScript (or very familiar with JS at all …)

[mahabaleshwars]

Hello @Bibo-Joshi,
Thank you for creating this issue. We will investigate it and provide feedback as soon as we have some updates.