chore(github): update issue and pr templates

Author: WSH032

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report 🐛
+about: Create a report to help us improve
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+## Describe the bug
+
+A clear and concise description of what the bug is.
+
+## To Reproduce
+
+Steps to reproduce the behavior:
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+## Expected behavior
+
+A clear and concise description of what you expected to happen.
+
+## Configuration
+
+```shell
+# use `pip freeze` to list all deps
+pip freeze
+```
+
+- Python version:
+- OS version:
+- deps version:
+- ...
+
+## Additional context
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+  - name: I have a question 🤔
+    url: https://github.com/WSH032/fastapi-proxy-lib/discussions
+    about: If you have any question that's not clearly a bug, please open a discussion first.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request 💡
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+## Have you discussed it?
+
+- [ ] I have discussed this feature request in discussions, and developers ask me directly to create an issue here.
+
+## Describe your feature request
+
+A clear and concise description of what the feature is.
+
+## Is your feature request related to a problem? Please describe
+
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+## Describe the solution you'd like
+
+A clear and concise description of what you want to happen.
+
+## Describe alternatives you've considered
+
+A clear and concise description of any alternative solutions or features you've considered.
+
+## Additional context
+
+Add any other context or screenshots about the feature request here.

.github/pull_request_template.md

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+<!-- copy from: https://github.com/encode/starlette/blob/master/.github/pull_request_template.md -->
+
+<!-- Thanks for contributing 💚
+Given this is a project maintained by volunteers, please read this template to not waste your time, or ours! 😁 -->
+
+# Summary
+
+<!-- Write a small summary about what is happening here. -->
+
+# Checklist
+
+- [ ] I've read `CONTRIBUTING.md`.
+- [ ] I understand that this PR may be closed in case there was no previous discussion. (This doesn't apply to typos!)
+- [ ] I've added a test for each change that was introduced, and I tried as much as possible to make a single atomic change.
+- [ ] I've updated the documentation accordingly.