feat: issue templates for bugs, features and questions

[eeberhard]

Description

• 134

This PR solves the issue by adding issue templates for the three types of feedback: bug reports, feature requests and questions. Features and bug reports are automatically added to our project backlog for triage. This repo will also use some labels and special issue titles to filter public user issues more easily.

Supporting information

You can see the issue templates in action here: https://github.com/eeberhard/test-repository/issues/new/choose

Review guidelines

Estimated Time of Review: 5 minutes

Checklist before merging:

• [x] Confirm that the relevant changelog(s) are up-to-date in case of any user-facing changes