chore: add a feature template (#9426)

.github/ISSUE_TEMPLATE/feature.yml

@@ -0,0 +1,17 @@
+name: Feature
+description: File a feature request
+title: '[Feature]: '
+labels: [feature]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        ### Thanks for taking the time to fill out a feature request!
+        **Before filling out this report**, please check [existing feature requests](https://github.com/puppeteer/puppeteer/issues?q=is%3Aissue++label%3Afeature+) and see if your feature has already been proposed.
+  - type: textarea
+    id: summary
+    attributes:
+      label: Feature description
+      description: Please describe your feature request with as many details as possible.
+    validations:
+      required: true