(dev) Issue Templateに、自分で実装してPRを出したいかの意思表明を追加 (#12799)

* Update 01_bug-report.yml

* Update 02_feature-request.yml

.github/ISSUE_TEMPLATE/01_bug-report.yml

@@ -89,3 +89,9 @@ body:
       render: markdown
     validations:
       required: false
+
+  - type: checkboxes
+    attributes:
+      label: Do you want to address this bug yourself?
+      options:
+        - label: Yes, I will patch the bug myself and send a pull request

.github/ISSUE_TEMPLATE/02_feature-request.yml

@@ -15,3 +15,8 @@ body:
       description: Describe the specific problem or need you think this feature will solve, and who it will help.
     validations:
       required: true
+  - type: checkboxes
+    attributes:
+      label: Do you want to implement this feature yourself?
+      options:
+        - label: Yes, I will implement this by myself and send a pull request