docs: issue templates

Author: adamberecz

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: "\U0001F41E Bug report"
+description: Create a report to help us improve Vueform Builder
+labels: ["pending triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please use a template below to create a minimal reproduction
+        👉 https://codesandbox.io/p/sandbox/github/vueform/builder-sandbox/tree/main
+  - type: textarea
+    id: bug-env
+    attributes:
+      label: Environment
+      description: Please list **framework with version** (Vite 4.5.0, Nuxt 3.7.4, etc.), **package manager** (npm/yarn/pnpm/bun), **@vueform/vueform version** and **@vueform/builder version**
+      placeholder: Environment
+    validations:
+      required: true
+  - type: textarea
+    id: reproduction
+    attributes:
+      label: Reproduction
+      description: Please provide a link to a repo that can reproduce the problem you ran into. A [**minimal reproduction**](https://codesandbox.io/p/sandbox/github/vueform/builder-sandbox/tree/main) is 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 "need reproduction" label. If no reproduction is provided we might close it.
+      placeholder: Reproduction
+    validations:
+      required: true
+  - type: textarea
+    id: bug-description
+    attributes:
+      label: Describe the bug
+      description: A clear and concise description of what the bug is.
+      placeholder: Bug description
+    validations:
+      required: true
+  - type: textarea
+    id: additonal
+    attributes:
+      label: Additional context
+      description: If applicable, add any other context about the problem 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

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true
+contact_links:
+  - name: 📚 Documentation
+    url: https://builder.vueform.com/docs/saving
+    about: Learning material for Vueform Builder
+  - name: 💬 Discussions
+    url: https://github.com/vueform/builder/discussions
+    about: Use discussions if you have another issue, an idea for improvement or for asking questions.

.github/ISSUE_TEMPLATE/feature-request.yml

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+name: "🚀 Feature request"
+description: Suggest a feature that will improve Vueform Builder
+labels: ["pending triage"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thank you for taking the time to fill out this feature request!
+  - type: textarea
+    id: feature-description
+    attributes:
+      label: Describe the feature
+      description: A clear and concise description of what you think would be a helpful addition to Vueform Builder, including the possible use cases and alternatives you have considered. If you have a working prototype that implements it, please include a link.
+      placeholder: Feature description
+    validations:
+      required: true
+  - type: checkboxes
+    id: required-info
+    attributes:
+      label: Final checks
+      description: Before submitting, please make sure you do the following
+      options:
+        - label: Check existing [issues](https://github.com/vueform/builder/issues) and [ideas](https://github.com/vueform/builder/discussions/categories/ideas).
+          required: true
+        - label: Check [roadmap](https://github.com/vueform/builder/discussions/categories/roadmap).
+          required: true