github: add issue templates

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: Bug Report
+description: Create a report with a procedure for reproducing the bug
+labels: "waiting-for-triage"
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is
+    validations:
+      required: true
+  - type: textarea
+    id: reproduce
+    attributes:
+      label: To Reproduce
+      description: Steps to reproduce the behavior
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected behavior
+      description: A clear and concise description of what you expected to happen
+    validations:
+      required: true
+  - type: textarea
+    id: environment
+    attributes:
+      label: Your Environment
+      description: |
+        - Fluentd or its package version: `fluentd --version` (Fluentd, fluent-package) or `td-agent --version` (td-agent)
+        - Operating system: `cat /etc/os-release`
+        - Kernel version: `uname -r`
+
+        Tip: If you hit the problem with older fluent-plugin-systemd version, try latest version first.
+      value: |
+        - Fluentd version:
+        - Package version:
+        - Operating system:
+        - Kernel version:
+      render: markdown
+    validations:
+      required: true
+  - type: textarea
+    id: configuration
+    attributes:
+      label: Your Configuration
+      description: |
+        Write your configuration here. Minimum reproducible fluentd.conf is recommended.
+      render: apache
+    validations:
+      required: true
+  - type: textarea
+    id: logs
+    attributes:
+      label: Your Error Log
+      description: Write your ALL error log here
+      render: shell
+    validations:
+      required: true
+  - type: textarea
+    id: addtional-context
+    attributes:
+      label: Additional context
+      description: Add any other context about the problem here.
+    validations:
+      required: false

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: false
+contact_links:
+  - name: Ask a Question
+    url: https://github.com/fluent/fluentd/discussions
+    about: I have questions about Fluentd and plugins. Please ask and answer questions at https://github.com/fluent/fluentd/discussions

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: Feature request
+description: Suggest an idea for this project
+labels: ["waiting-for-triage", "enhancement"]
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Is your feature request related to a problem? Please describe.
+      description: |
+        A clear and concise description of what the problem is.
+        Ex. I'm always frustrated when [...]
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Describe the solution you'd like
+      description: A clear and concise description of what you want to happen.
+    validations:
+      required: true
+  - type: textarea
+    id: alternative
+    attributes:
+      label: Describe alternatives you've considered
+      description: A clear and concise description of any alternative solutions or features you've considered.
+    validations:
+      required: true
+  - type: textarea
+    id: addtional-context
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.
+    validations:
+      required: false
+