[Backport] Update issue templates for Magento 2 GitHub project

[mage2pratik]

Original Pull Request

#17817

Description

This pull request adds more templates to the Issue Reporting section of the GitHub. New templates are targeting a broader scope of possible problems and proposed descriptions are aimed at simplifying future fixes.

Proposed set of templates currently cover:

• Bug report (same, default bug report template)
• Developer experience issue (Issues related directly to the application design and architecture, for example: modularity, extensibility, ability to customize, etc.)
• Feature requests (clarifies, that separate project is used for that, requests minimum input and description)

Fixed Issues (if relevant)

N/A

Manual testing scenarios

N/A

Contribution checklist

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[magento-engcom-team]

Hi @osrecio, thank you for the review.
ENGCOM-2897 has been created to process this Pull Request

[ishakhsuvarov]

Hi @mage2pratik @osrecio
I don't think these changes are required in the 2.1-develop branch. GitHub UI only pulls templates from the default repo branch and it doesn't seem like we will make 2.1 default in the future :)

[osrecio]

Yes you're right @ishakhsuvarov . I will only accept 2.3-develop PR.

I will close this PR. If something change with branches I will re-open.