Add templates for issues and PR

[jahow]

This PR adds templates for issues (bug and proposal) as well as a template for PRs with a QA checklist.

[github-actions]

Affected libs: , Affected apps: ,

• 🚀 Build and deploy storybook and demo on GitHub Pages
• 📦 Build and push affected docker images

[fgravin]

What would be the lifecycle of this kind of request ?
Like any development would need funding.

It's not clear if someone wants to add a feature, or expect us to implement his feature.

[jahow]

It's not supposed to be for request, but for proposal. It says "a feature or task that you intend to push forward".

Basically this is meant for people that have the funding/time to implement something and want to get approval from the project.

[jahow]

I added a separate proposal.md template for proposals with funding, and the feature_request template is now for requests/suggestions but without actual funding/intention to contribute.