chore: Convert templates to YAML issue forms

.github/ISSUE_TEMPLATE/3_proposal.yml

@@ -0,0 +1,45 @@
+name: Proposal
+description: Suggest an idea for this project
+title: 'proposal: '
+labels: proposal
+assignees: peaceiris
+body:
+  - type: markdown
+    attributes:
+      value:
+        Please note we will close your issue without comment if you do not fill out the issue checklist below and provide ALL the requested information.
+  - type: checkboxes
+    attributes:
+      label: Checklist
+      description: Checklist before creating an issue.
+      options:
+        - label: "I am using the latest version of this aciton."
+          required: true
+        - label: "I have read the latest README and followed the instructions."
+          required: true
+        - label: "I have read the latest GitHub Actions official documentation and learned the basic spec and concepts."
+          required: true
+  - type: textarea
+    attributes:
+      label: "Describe your proposal"
+      description: "A clear and concise description of what the proposal is."
+    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: true
+  - type: textarea
+    attributes:
+      label: "Additional context"
+      description: "Add any other context or screenshots about the feature request here."
+    validations:
+      required: true