community: add issue/PR templates, code of conduct, update contributing guide

.github/ISSUE_TEMPLATE/feature_request.yml

@@ -0,0 +1,30 @@
+name: Feature Request
+description: Suggest a new feature or improvement
+labels: ["enhancement"]
+body:
+  - type: textarea
+    id: problem
+    attributes:
+      label: Problem
+      description: What problem does this solve?
+    validations:
+      required: true
+  - type: textarea
+    id: solution
+    attributes:
+      label: Proposed solution
+      description: How would you like it to work?
+  - type: dropdown
+    id: protocol
+    attributes:
+      label: Related protocol
+      options:
+        - Docker
+        - npm
+        - Maven
+        - PyPI
+        - Cargo
+        - Raw
+        - CLI
+        - UI/Dashboard
+        - General