Feature Request Form in Issue Template

[cyschneck]

PR Summary

Add link to Feature Request Form in Issue Template

Related Tickets & Documents

Closes #622

PR Checklist

General

• [x] PR includes a summary of changes
• [x] Link relevant issues, make one if none exist
• [x] Add a brief summary of changes to docs/release-notes.rst in a relevant section for the upcoming release.
• [x] Add appropriate labels to this PR
• [x] PR follows the Contributor's Guide