doc: openapi/swagger Generation for docs

buf.gen.yaml

@@ -11,3 +11,10 @@ plugins:
   - name: grpc-gateway
     out: gen/grpc/
     opt: paths=source_relative
+
+  - name: swagger
+    out: reports/swagger
+
+  - name: openapiv2
+    out: reports/openapiv2
+