Add issue templates to github

Summary: Add YAML files for Bug Report, Feature Request, and General Question issues

Differential Revision: D59600625

.github/ISSUE_TEMPLATE/1_bug_report.yaml

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+name: Bug Report
+description: File a bug report.
+title: "[Bug]: "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to fill out a bug report. We strive to make Ax a useful and stable library for all our users.
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: Provide a detailed description of the bug as well as the expected behavior.
+    validations:
+      required: true
+  - type: textarea
+    id: repro
+    attributes:
+      label: Please provide a minimal, reproducible example of the unexpected behavior.
+      description: Follow [these guidelines](https://stackoverflow.com/help/minimal-reproducible-example) for writing your example.
+    validations:
+      required: true
+  - type: textarea
+    id: traceback
+    attributes:
+      label: Please paste any relevant traceback/logs produced by the example provided.
+      description: This will be automatically formatted into code, so no need for backticks.
+      render: shell
+  - type: input
+    id: ax-version
+    attributes:
+      label: Ax Version
+      description: What version of Ax are you using?
+    validations:
+      required: true
+  - type: input
+    id: python-version
+    attributes:
+      label: Python Version
+      description: What version of Python are you using?
+    validations:
+      required: true
+  - type: input
+    id: os
+    attributes:
+      label: Operating System
+      description: What operating system are you using?
+    validations:
+      required: true
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow Ax's [Code of Conduct](https://github.com/facebook/Ax/blob/main/CODE_OF_CONDUCT.md).
+      options:
+        - label: I agree to follow Ax's Code of Conduct
+          required: true

.github/ISSUE_TEMPLATE/2_feature_request.yaml

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+name: Feature Request
+description: Request a feature or improvement to Ax.
+title: "[FEATURE REQUEST]: "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to request a feature! We strive to make Ax a useful and rich library for our users.
+  - type: textarea
+    id: motivation
+    attributes:
+      label: Motivation
+      description: Provide a detailed description of the problem you would like to solve via this new feature or improvement.
+    validations:
+      required: true
+  - type: textarea
+    id: pitch
+    attributes:
+      label: Describe the solution you'd like to see implmented in Ax
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Describe any alternatives you've considered to the above solution
+  - type: textarea
+    id: related
+    attributes:
+      label: Is this related to an existing issue in Ax or another repository? If so please include links to those Issues here.
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue, you agree to follow Ax's [Code of Conduct](https://github.com/facebook/Ax/blob/main/CODE_OF_CONDUCT.md).
+      options:
+        - label: I agree to follow Ax's Code of Conduct
+          required: true

.github/ISSUE_TEMPLATE/3_general_support.yaml

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+name: General Support
+description: Get advice on an experiment you're currently running, ask questions about methods, and receive general help with Ax.
+title: "[GENERAL SUPPORT]: "
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for reaching out -- we will do our best to respond to your inquiry promptly.
+  - type: textarea
+    id: question
+    attributes:
+      label: Question
+      description: Provide a detailed description of the problem your facing or the question you would like help answering.
+    validations:
+      required: true
+  - type: textarea
+    id: snippet
+    attributes:
+      label: Please provide any relevant code snippet if applicable.
+      description: This will be automatically formatted into code, so no need for backticks.
+      render: shell
+  - type: checkboxes
+    id: terms
+    attributes:
+      label: Code of Conduct
+      description: By submitting this issue you agree to follow Ax's [Code of Conduct](https://github.com/facebook/Ax/blob/main/CODE_OF_CONDUCT.md).
+      options:
+        - label: I agree to follow this Ax's Code of Conduct
+          required: true