feat(github): Add PULL_REQUEST_TEMPLATE.md

.github/PULL_REQUEST_TEMPLATE.md

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+<!--
+First of all, thank you for your contribution! 😄
+Before submitting your pull request, please make sure the checklist below is confirmed.
+Your pull requests will be merged after one of the collaborators approve.
+Thank you!
+-->
+
+### 📦 Modified package
+
+- [ ] @oceanbase/design
+- [ ] @oceanbase/ui
+- [ ] @oceanbase/icons
+- [ ] @oceanbase/charts
+- [ ] @oceanbase/util
+- [ ] @oceanbase/codemod
+- [ ] Other (about what?)
+
+### 🤔 This is a ...
+
+- [ ] New feature
+- [ ] Bug fix
+- [ ] Site / documentation update
+- [ ] Demo update
+- [ ] Component style update
+- [ ] TypeScript definition update
+- [ ] Bundle size optimization
+- [ ] Performance optimization
+- [ ] Enhancement feature
+- [ ] Internationalization
+- [ ] Refactoring
+- [ ] Code style optimization
+- [ ] Test Case
+- [ ] Branch merge
+- [ ] Workflow
+- [ ] Other (about what?)
+
+### 🔗 Related issue link
+
+<!--
+1. Put the related issue or discussion links here.
+2. close #xxxx or fix #xxxx for instance.
+-->
+
+### 💡 Background and solution
+
+<!--
+1. Describe the problem and the scenario.
+2. GIF or snapshot should be provided if includes UI/interactive modification.
+3. How to fix the problem, and list the final API implementation and usage sample if that is a new feature.
+-->
+
+### 📝 Changelog
+
+<!--
+Describe changes from the user side, and list all potential break changes or other risks.
+--->
+
+| Language   | Changelog |
+| ---------- | --------- |
+| 🇺🇸 English |           |
+| 🇨🇳 Chinese |           |
+
+### ☑️ Self-Check before Merge
+
+⚠️ Please check all items below before requesting a reviewing. ⚠️
+
+- [ ] Doc is updated/provided or not needed
+- [ ] Demo is updated/provided or not needed
+- [ ] TypeScript definition is updated/provided or not needed
+- [ ] Tests is updated/provided or not needed
+- [ ] Changelog is provided or not needed