add structured GitHub issue template

[Princess0407]

Description

The repository has 115+ open issues but no .github/ISSUE_TEMPLATE/ directory. Contributors open issues without structure, creating triage overhead for maintainers. Sometimes, many of them lack necessities required for a particular label.

Proposed Work

• .github/ISSUE_TEMPLATE/bug_report.yml : YAML form for bugs
• .github/ISSUE_TEMPLATE/feature_request.yml: YAML form for features
• .github/ISSUE_TEMPLATE/task.yml: YAML form for tasks
• .github/ISSUE_TEMPLATE/config.yml: redirects to Slack/docs/security

Why This Matters

• Standardizes bug reports (repro steps, expected vs actual, environment).
• Reduces back-and-forth triage for maintainers.

I can open a PR for this.

[pocopepe]

ah I saw someone bring the same up on the slack channel and I remember one of the mainters mentioning that they don't see a need for it as of now a month ago or so. Not sure what they think of it now, thought I'd mention it