Update issue templates

.github/ISSUE_TEMPLATE/🐛-bug-report.md

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+---
+name: "\U0001F41B Bug report"
+about: Create a report to help us improve
+title: "[BUG]"
+labels: ''
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior:
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Screenshots**
+If applicable, add screenshots to help explain your problem.
+
+**CocoIndex Version**
+Which version of CocoIndex are you using?
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/💡-feature-request.md

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+---
+name: "\U0001F4A1 Feature request"
+about: Suggest an idea for this project
+title: "[FEATURE]"
+labels: ''
+assignees: ''
+
+---
+
+**What is the use case? **
+
+**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.