Add GitHub issue forms [SDK-4269]

[Widcket]

Description

This PR adds issue forms for feature requests and bug reports. This repository does not currently have any issue templates, so none was removed.

Checklist

• [X] I have added documentation for new/changed functionality in this PR or in auth0.com/docs
• [X] All active GitHub checks for tests, formatting, and security are passing
• [X] The correct base branch is being used, if not the default branch