chore(github): add separate v3 issue template (#2307)

.github/ISSUE_TEMPLATE/bug-v3.yml

@@ -0,0 +1,65 @@
+name: "🐛 Bug report (v3)"
+description: Report a bug to help us improve the module (v3 only).
+labels: ["triage", "bug", "v3"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        > [!IMPORTANT]  
+        > As Nuxt UI v3 is currently in alpha, we recommend thorough testing before using it in production environments. We're actively working on stabilization and welcome feedback from early adopters to improve the library. 
+  - type: markdown
+    attributes:
+      value: |
+        Before reporting a bug, please make sure that you have read through our [v3 documentation](https://ui3.nuxt.dev/) and existing [issues](https://github.com/nuxt/ui/issues?q=is%3Aissue%20is%3Aopen%20sort%3Aupdated-desc%20label%3Av3).
+  - type: textarea
+    id: env
+    attributes:
+      label: Environment
+      description: You can use `npx nuxi info` to fill this section
+      placeholder: |
+        - Operating System: `Darwin`
+        - Node Version:     `v18.16.0`
+        - Nuxt Version:     `3.7.3`
+        - CLI Version:      `3.8.4`
+        - Nitro Version:    `2.6.3`
+        - Package Manager:  `pnpm@8.7.4`
+        - Builder:          `-`
+        - User Config:      `-`
+        - Runtime Modules:  `-`
+        - Build Modules:    `-`
+    validations:
+      required: true
+  - type: input
+    id: version
+    attributes:
+      label: Version
+      placeholder: v3.0.0-alpha.5
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Reproduction
+      description: Please provide a reproduction link. A minimal [reproduction is required](https://antfu.me/posts/why-reproductions-are-required) unless you are absolutely sure that the issue is obvious and the provided information is enough to understand the problem. If a report is vague (e.g. just a generic error message) and has no reproduction, it will receive a "needs reproduction" label. If no reproduction is provided we might close it.
+      placeholder: https://github.com/my/reproduction
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: A clear and concise description of what the bug is. If you intend to submit a PR for this issue, tell us in the description.
+    validations:
+      required: true
+  - type: textarea
+    id: additonal
+    attributes:
+      label: Additional context
+      description: If applicable, add any other context or screenshots here.
+  - type: textarea
+    id: logs
+    attributes:
+      label: Logs
+      description: |
+        Optional if provided reproduction. Please try not to insert an image but copy paste the log text.
+      render: shell-script