ci: convert github issue templates from markdown to yaml

[juarezr]

This PR aims to improve the bug report and feature request processes.

Changes

1. Converted github issue templates from markdown to yaml
2. Categorized questions in bug and feature templates

Checklist

Use this checklist to ensure the quality of pull requests that include new code and changes to existing code.

• [ ] Source Code guidelines:
  • [ ] Includes unit tests
  • [ ] New functions have docstrings with examples that can be run with doctest
  • [ ] New functions are included in API docs
  • [ ] Docstrings include notes for any changes to API or behavior
  • [ ] All changes are documented in docs/changes.rst
  • [X] No user-facing changes
• [X] Versioning and history tracking guidelines:
  • [X] Using atomic commits whenever possible
  • [X] Commits are reversible whenever possible
  • [X] There are no incomplete changes in the pull request
  • [X] There is no accidental garbage added to the source code
• [ ] Testing guidelines:
  • [ ] Tested locally using tox / pytest
  • [ ] Rebased to the master branch and tested before sending the PR
  • [ ] Automated testing passes (see CI)
  • [ ] Unit test coverage has not decreased (see Coveralls)
  • [X] No source code changes
• [ ] State of these changes is:
  • [ ] Just a proof of concept
  • [X] Work in progress / Further changes needed
  • [X] Ready to review
  • [ ] Ready to merge

[coveralls]

Pull Request Test Coverage Report for Build 8284919063

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 91.072%

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Totals
Change from base Build 8282263331:	0.0%
Covered Lines:	13352
Relevant Lines:	14661

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💛 - Coveralls