Add issue templates for SMD repo (#378)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: 🐛 Bug Report
+description: Create a report to help us reproduce and fix the bug.
+
+body:
+- type: markdown
+  attributes:
+    value: >
+      #### Before submitting a bug, please make sure the issue hasn't been already addressed by searching through [the existing and past issues](https://github.com/aws/sagemaker-distribution/issues?q=is%3Aissue+sort%3Acreated-desc+).
+- type: dropdown
+  id: category
+  attributes:
+    label: Category
+    description: What is the type of the bug?
+    options:
+      - Compatibility Issue
+      - Image Size Issue
+      - Performance Issue
+      - Usability Issue
+      - Others
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: 🐛 Describe the bug
+    description: |
+      Please provide a clear and concise description of what the bug is.
+      
+      If relevant, add a minimal example so that we can reproduce the error by running the code. It is very important for the snippet to be as succinct (minimal) as possible, so please take time to trim down any irrelevant code to help us debug efficiently. We are going to copy-paste your code and we expect to get the same result as you did: avoid any external data, and include the relevant imports, etc.
+ 
+      Please also paste or describe the results you observe.
+      If you observe an error, please paste the error message including the **full** traceback of the exception. It may be relevant to wrap error messages in ```` ```triple quotes blocks``` ````.
+    placeholder: |
+      A clear and concise description of what the bug is. If you have a screenshot of the issue, please upload it here.
+
+      ```python
+      # Sample code to reproduce the problem
+      ```
+
+      ```
+      The error message you got, with the full traceback.
+      ```
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: 🐛 Describe the expected behavior
+    description: |
+      Please provide a clear and concise description of the expected behaviors.
+  validations:
+    required: false
+- type: textarea
+  attributes:
+    label: Image Tags
+    description: |
+      Please specify which image versions you reproduced the issue on. (e.g. 1.6.1-cpu)
+  validations:
+    required: true
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!

.github/ISSUE_TEMPLATE/config.yml

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+contact_links:
+    - name: Report a security vulnerability
+      url: http://aws.amazon.com/security/vulnerability-reporting/
+      about: This issue tracker is not for security vulnerabilities. Please report issues here.

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: 🚀 Feature request
+description: Submit a proposal/request for a new feature
+
+body:
+- type: textarea
+  attributes:
+    label: 🚀 The feature, motivation and pitch
+    description: >
+      A clear and concise description of the feature proposal. Please outline the motivation for the proposal. Is your feature request related to a specific problem? e.g., *"I'm working on X and would like Y to be possible"*. If this is related to another GitHub issue, please link here too.
+  validations:
+    required: true
+- type: textarea
+  attributes:
+    label: Use case description
+    description: >
+      A description of the use cases of your proposed feature, if any.
+- type: textarea
+  attributes:
+    label: Alternatives
+    description: >
+      A description of any alternative solutions or features you have considered, if any.
+- type: textarea
+  attributes:
+    label: Additional context
+    description: >
+      Add any other context or screenshots about the feature request.
+- type: markdown
+  attributes:
+    value: >
+      Thanks for contributing 🎉!