chore: add bot config files and update issue templates (#7249)

* chore: add bot config files and update issue templates

* fix: exclude SIP

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+
+---
+
+A clear and concise description of what the bug is.
+
+### Expected results
+
+what you expected to happen.
+
+### Actual results
+
+what actually happens.
+
+#### Screenshots
+
+If applicable, add screenshots to help explain your problem.
+
+#### How to reproduce the bug
+
+1. Go to '...'
+2. Click on '....'
+3. Scroll down to '....'
+4. See error
+
+### Environment
+
+(please complete the following information):
+
+- superset version: [e.g. `v0.29`, `master`, `commit`]
+- python version: `python --version`
+- node.js version: `node -v`
+- npm version: `npm -v`
+
+### Checklist
+
+Make sure these boxes are checked before submitting your issue - thank you!
+
+- [ ] I have checked the superset logs for python stacktraces and included it here as text if there are any.
+- [ ] I have reproduced the issue with at least the latest released version of superset.
+- [ ] I have checked the issue tracker for the same issue and I haven't found one similar.
+
+### Additional context
+
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+
+---
+
+**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/ISSUE_TEMPLATE/sip.md

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+---
+name: SIP
+about: Superset Improvement Proposal
+
+---
+
+## [SIP] Proposal for XXX
+
+### Motivation
+
+Description of the problem to be solved.
+
+### Proposed Change
+
+Describe how the feature will be implemented, or the problem will be solved. If possible, include mocks, screenshots, or screencasts (even if from different tools).
+
+### New or Changed Public Interfaces
+
+Describe any new additions to the model, views or `REST` endpoints. Describe any changes to existing visualizations, dashboards and React components. Describe changes that affect the Superset CLI and how Superset is deployed.
+
+### New dependencies
+
+Describe any `npm`/`PyPI` packages that are required. Are they actively maintained? What are their licenses?
+
+### Migration Plan and Compatibility
+
+Describe any database migrations that are necessary, or updates to stored URLs.
+
+### Rejected Alternatives
+
+Describe alternative approaches that were considered and rejected.