docs: add GitHub discussion templates

[iamvirul]

Description

This PR adds standard discussion templates to the repository to structure community interactions better. It includes templates for Q&A, Ideas, and General discussions.

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update
• Code refactoring
• Performance improvement
• Test addition or update
• Build system / CI changes
• Other (please describe):

Related Issues

• Related to [FEATURE: DOCS] Enable discussions (Github Discussions) in the repo #11

Changes Made

Documentation Changes

• Added `.github/DISCUSSION_TEMPLATE/q-a.yml`: Template for questions.
• Added `.github/DISCUSSION_TEMPLATE/ideas.yml`: Template for feature requests and ideas.
• Added `.github/DISCUSSION_TEMPLATE/general.yml`: Template for general discussions.

ADR Requirements

• This change requires an ADR
• This change does not require an ADR
• ADR status: N/A

Safety Considerations

• This PR has no safety/security implications

Testing

• Manual testing performed
  • Verified files were created in the correct directory.

Checklist

• Code follows the project's style guidelines
• Self-review of code completed
• Documentation updated (if applicable)
• No new warnings generated
• Changes are backward compatible (or breaking changes are documented)