ci: add issue template

Signed-off-by: zhuwenxing <wenxing.zhu@zilliz.com>

.github/ISSUE_TEMPLATE/bug_report.yaml

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+name: 🐞 Bug report
+description: Create a bug report to help us improve MilvusCDC
+title: "[Bug]: " 
+body:
+- type: markdown
+  attributes:
+    value: |
+      Thanks for taking the time to fill out this bug report! Please fill the form in English!
+- type: textarea
+  attributes:
+    label: Current Behavior
+    description: A concise description of what you're experiencing.
+    placeholder: |
+      When I do <X>, <Y> happens and I see the error message attached below:
+      ```...```
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Expected Behavior
+    description: A concise description of what you expected to happen.
+    placeholder: When I do <X>, <Z> should happen instead.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Steps To Reproduce
+    description: Steps to reproduce the behavior.
+    placeholder: |
+      1. In this environment...
+      2. With this config...
+      3. Run '...'
+      4. See error...
+    render: markdown
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Environment
+    description: |
+      Enter the Environment Details:
+    render: markdown
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Anything else?
+    description: |
+      Links? References? Anything that will give us more context about the issue you are encountering!
+  validations:
+    required: false

.github/ISSUE_TEMPLATE/documentation_improvement.yaml

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+name: 📖 Documentation Improvement
+description: Suggest improvements to our documentation
+title: "[DOCS]: "
+labels: [Documentation] 
+body:
+- type: markdown
+  attributes:
+    value: |
+      Thanks for taking the time to fill out this documentation improvement request!
+- type: textarea
+  attributes:
+    label: Documentation Link 
+    description: Add a link to the page which needs improvement (if relevant)
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Describe the problem
+    description: Is the documentation missing? Or is it confusing? Why is it confusing?
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Describe the improvement
+    description: A clear and concise description of the improvement.  
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Anything else?
+    description: |
+      Links? References? Anything that will give us more context about the issue you are encountering!
+  validations:
+    required: false

.github/ISSUE_TEMPLATE/enhancement.yaml

@@ -0,0 +1,30 @@
+name: Enhancement request
+description: As a developer, I want to make an enhancement for MilvusCDC
+title: "[Enhancement]:"
+labels: [kind/enhancement]
+body:
+- type: markdown
+  attributes:
+    value: |
+      Thanks for taking the time to request/suggest an enhancement for MilvusCDC! Please fill the form in English!
+- type: textarea
+  attributes:
+    label: What would you like to be added?
+    description: A concise description of what you're expecting/suggesting.
+    placeholder: |
+      I would like to suggest/request a feature that's like...
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Why is this needed?
+    description: A concise description of the reason/motivation
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Anything else?
+    description: |
+      Links? References? Anything that will give us more context about this!
+  validations:
+    required: false

.github/ISSUE_TEMPLATE/feature-request.yaml

@@ -0,0 +1,36 @@
+name: 🚀 Feature request
+description: As a user, I want to request a feature for MilvusCDC
+title: "[Feature]:"
+labels: [kind/feature]
+body:
+- type: markdown
+  attributes:
+    value: |
+      Thanks for taking the time to request a feature for MilvusCDC! Please fill the form in English!
+- type: textarea
+  attributes:
+    label: Is your feature request related to a problem? Please describe.
+    description: A concise description of the problem you are facing or the motivation behind this feature request.
+    placeholder: |
+      I faced a problem due to which ...
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Describe the solution you'd like.
+    description: A concise description of the solution for the issue.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Describe an alternate solution.
+    description: Is there any other approach to solve the problem?
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Anything else? (Additional Context)
+    description: |
+      Links? References? Anything that will give us more context about this!
+  validations:
+    required: false