PULL_REQUEST_TEMPLATE.md

Closes: ?

What are the changes and their implications?

Bug Checklist

• Changeset added (run pnpm changeset in the root directory)
• Integration test added (see test docs if needed)

Feature Checklist

• Changeset added (run pnpm changeset in the root directory)
• Integration test added (see test docs if needed)
• Documentation added/updated (submit PR to blitzjs.com repo main branch)