have good templates for different issue types (#417)

.github/ISSUE_TEMPLATE/bug_report.yml

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+name: 🐛 Bug Report
+description: File a bug report for the Buildkite CLI
+title: "[Bug]: "
+labels: ["bug", "triage"]
+projects: ["buildkite/cli"]
+assignees:
+  - @buildkite/technical-services
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: input
+    id: contact
+    attributes:
+      label: Contact Details
+      description: How can we get in touch with you if we need more info?
+      placeholder: ex. email@example.com
+    validations:
+      required: false
+  - type: textarea
+    id: what-happened
+    attributes:
+      label: What happened?
+      description: Also tell us, what did you expect to happen?
+      placeholder: Tell us what you see!
+      value: "A bug happened!"
+    validations:
+      required: true
+  - type: dropdown
+    id: version
+    attributes:
+      label: Version
+      description: What version of our software are you running?
+    validations:
+      required: true
+  - type: dropdown
+    id: browsers
+    attributes:
+      label: What environment are you seeing the problem on?
+      multiple: true
+      options:
+        - CI
+        - Local Development
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output. This will be automatically formatted into code, so no need for backticks.
+      render: shell

.github/ISSUE_TEMPLATE/feature_request.yml

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+name: 💡 Feature Request
+description: Suggest an idea for this project.
+title: "💡 feat: <title>"
+labels: [Enhancement]
+body:
+  - type: textarea
+    attributes:
+      label: Is your feature request related to a problem?
+      description: A clear and concise description of what the problem is. Ex. I'm always frustrated when [...].
+    validations:
+      required: true
+
+  - type: textarea
+    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
+    attributes:
+      label: Describe alternatives you've considered.
+      description: A clear and concise description of any alternative solutions or features you've considered.
+    validations:
+      required: false
+
+  - type: textarea
+    attributes:
+      label: Additional context
+      description: Add any other context or screenshots about the feature request here.
+    validations:
+      required: false