Switch issue templates to use the new issue forms alpha

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,40 @@
+name: Feature Request
+about: Suggest a feature for this library
+labels: feature request
+issue_body: true
+inputs:
+  - type: input
+    attributes:
+      label: Summary
+      description: >
+        A short summary of what your feature request is.
+      required: true
+  - type: dropdown
+    attributes:
+      label: What is the feature request for?
+      required: true
+      choices:
+        - The core library
+        - discord.ext.commands
+        - discord.ext.tasks
+        - The documentation
+  - type: textarea
+    attributes:
+      label: The Problem
+      description: >
+        What problem is your feature trying to solve?
+        What becomes easier or possible when this feature is implemented?
+      required: true
+  - type: textarea
+    attributes:
+      label: The Ideal Solution
+      description: >
+        What is your ideal solution to the problem?
+        What would you like this feature to do?
+      required: true
+  - type: textarea
+    attributes:
+      label: The Current Solution
+      description: >
+        What is the current solution to the problem, if any?
+      required: false