New GitHub templates (#12777)
* Create 01-build.yml
* Create 02-documentation.yml
* Create 03-mobile.yml
* Create 04-web.yml
* Create 05-performance.yml
* Create 06-training.yml
* Create 07-feature_request.yml
* Create 08-general.yml
* Create config.yml
* Delete bug-performance-issue.md
* Delete feature_request.md
* Create labeler.yml
* Create labeler.yml
* Update Performance template to make model info optional.
* Update feature request description placeholder
