add checkbox to all issue templates

Author: willpinha

.github/ISSUE_TEMPLATE/improvement.yml

@@ -32,3 +32,6 @@ body:
       description: If you want, you will be assigned to the issue and can make a pull request fixing it.
       Otherwise, a `help-wanted` label will be added to it. The first contributor who asks to
       contribute will be assigned the issue and the `help-wanted` label will be removed
+      options:
+        - label: Yes, I want to contribute!
+        - label: No, I will leave the issue to another contributor

.github/ISSUE_TEMPLATE/report_problem.yml

@@ -25,3 +25,13 @@ body:
     attributes:
       label: Screenshots (if applicable)
       description: Include screenshots that help illustrate the problem
+
+  - type: checkboxes
+    attributes:
+      label: Do you want to contribute to this issue?
+      description: If you want, you will be assigned to the issue and can make a pull request fixing it.
+      Otherwise, a `help-wanted` label will be added to it. The first contributor who asks to
+      contribute will be assigned the issue and the `help-wanted` label will be removed
+      options:
+        - label: Yes, I want to contribute!
+        - label: No, I will leave the issue to another contributor