migrate: feature_request and bug_report from md to yaml

[tree-1917]

Summary

This pull request migrates the feature_request and bug_report issue templates from Markdown (.md) to YAML (.yaml), making them compatible with GitHub’s modern Issue Forms workflow.

What Changed?

• Removed:
  • feature_request.md
  • bug_report.md
• Added / Updated:
  • feature_request.yaml
  • bug_report.yaml
• Updated both templates to use GitHub Issue Forms for improved structure and validation.

Why This Change?

• YAML Issue Forms provide a cleaner and more user-friendly interface.
• Support for required fields, dropdowns, placeholders, and clearer guidance.
• Ensures consistency across all issue templates in the repository.
• Aligns with GitHub’s recommended format for issue templates.