Feat: Add GitHub templates

Author: eremannisto

.github/ISSUE_TEMPLATE/BUG_REPORT.md

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+---
+name: Bug report
+about: Something isn't working
+---
+
+**Component**
+Which component is affected?
+
+**Expected behavior**
+What should happen?
+
+**Actual behavior**
+What happens instead?
+
+**Reproduction**
+Minimal example to reproduce the issue.
+
+**Environment**
+- Package version:
+- Astro version:
+- Node version:

.github/ISSUE_TEMPLATE/FEATURE_REQUEST.md

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+---
+name: Feature request
+about: Suggest an improvement
+---
+
+**Problem**
+What problem does this solve?
+
+**Proposed solution**
+What would you like to see added or changed?
+
+**Alternatives considered**
+Any other approaches you've thought about?

.github/PULL_REQUEST_TEMPALTE.md

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+## What does this PR do?
+
+## Type of change
+- [ ] Bug fix
+- [ ] New feature
+- [ ] Breaking change
+- [ ] Documentation update
+
+## Checklist
+- [ ] `pnpm check` passes
+- [ ] `pnpm test:unit` passes
+- [ ] `pnpm test:e2e` passes
+- [ ] `README` updated if needed