[REPO] Add New Feature Template (#10238)

Adding for cases when it's not a bug, but a feature request. Helping
those and us frame the initial request better.

.github/ISSUE_TEMPLATE/feature.yaml

@@ -0,0 +1,28 @@
+name: Feature Request
+description: Suggest a new feature or improvement to Certbot
+title: "[Feature Request]: "
+labels: ["feature request"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: What problem does this feature solve or what does it enhance?
+      description: Explain what this feature addresses, or the benefit it provides.
+      placeholder: For example, "Currently, users have to manually do X, which is time-consuming."
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed Solution
+      description: Describe the solution you'd like to see implemented.
+      placeholder: For example, "Implement a new button that automatically does X."
+    validations:
+      required: true
+  - type: textarea
+    id: alternatives
+    attributes:
+      label: Alternatives Considered
+      description: Have you considered any alternative solutions?
+      placeholder: For example, "We considered Y, but Z is a better approach because..."
+