chore: Added GitHub PR template

.github/pull_request_template.md

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+<!--
+Thank you for sending the PR! We appreciate you spending the time to work on these changes.
+Happy contributing!
+-->
+
+## Pre-flight checklist
+
+- [ ] Commit messages follow the [conventional commits](https://www.conventionalcommits.org/) spec
+- [ ] **If this changes code in a published NPM package**: I have run `npm run changeset` to create a `changeset` JSON document appropriate for this change.
+
+## Motivation
+
+<!-- Help us understand your motivation by explaining why you decided to make this change. Does this fix a bug? Does it close an issue? -->
+
+## Test Plan
+
+<!-- Write your test plan here. If you changed any code, please provide us with clear instructions on how you verified your changes work. -->
+
+## Related issues/PRs
+
+<!-- If you haven't already, link to issues/PRs that are related to this change. This helps us develop the context and keep a rich repo history. If this PR is a continuation of a past PR's work, link to that PR. If the PR addresses part of the problem in a meta-issue, mention that issue. -->
+