chore: add github issue forms (#105)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: File a bug report
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+
+  - type: input
+    attributes:
+      label: Operating System
+      description: What operating system are you using?
+      placeholder: "Example: Debian GNU/Linux 9 (stretch)"
+    validations:
+      required: true
+  - type: input
+    attributes:
+      label: Go Version
+      description: What version of golang are you using?
+      placeholder: "Example: go1.16.5 linux/amd64"
+    validations:
+      required: true
+  - type: input
+    attributes:
+      label: Package Version
+      description: What version of bytedance/gopkg are you using?
+      placeholder: "Example: 20210913/main/develop"
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Affected Packages 
+      description: Which packages are affected by this issue?
+      placeholder: |
+        One package per line, for example:
+
+        - lang/fastrand
+        - collection/skipset
+        - ...
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Actual Behavior
+      description: What actually happened?
+    validations:
+      required: true
+  - type: textarea
+    attributes:
+      label: Reproduction Steps
+      description: How do you trigger this bug? Please walk us through it step by step.
+      placeholder: |
+        1.
+        2.
+        3.
+        ...
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Other Information
+      description: Do you still need to add any information?

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: Security Bug Report
+    url: https://github.com/bytedance/gopkg/blob/develop/CONTRIBUTING.md#3-security-bugs
+    about: |
+      Please do not report the safe disclosure of bugs to public issues.
+      Contact us by email ([email protected])

.github/ISSUE_TEMPLATE/feature_reqeust.yml

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+# Reference: https://github.com/jekyll/jekyll/blob/master/.github/ISSUE_TEMPLATE/feature_request.md
+
+name: Feature Request
+description: File a feature request
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this feature request!
+
+  - type: textarea
+    attributes:
+      label: Summary
+      description: Please give a one-paragraph explanation of the feature.
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Motivation
+      description: Why do you want to see this feature? 
+    validations:
+      required: true
+
+  - type: textarea
+    attributes:
+      label: Explanation
+      description: |
+        Please explain the proposal as if it was already included in the project and you
+        were teaching it to another programmer. That generally means:
+
+        - Introducing new named concepts.
+        - Explaining the feature largely in terms of examples.
+        - If applicable, provide sample error messages, deprecation warnings, or
+        migration guidance.
+        
+        *If this is a small feature, you may omit this section.*

.github/ISSUE_TEMPLATE/question.yml

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+name: Question
+description: Ask a question
+labels: ["question"]
+body:
+  - type: textarea
+    attributes:
+      label: Question
+      description: What do you want to know?
+    validations:
+      required: true