Update proto definitions

wb/products.proto

@@ -3,4 +3,23 @@ package wb.products;
 option go_package = "./wb/products";
 
 service ProductsService {
+  rpc GetProducts(GetProductsRequest) returns (stream GetProductsResponse);
+}
+
+message GetProductsRequest {
+  int64 marketplace_id = 1;
+
+}
+
+message Product {
+  message Size{
+    repeated string skus = 1;
+  }
+  int64 nm_id = 1;
+  int64 subject_id = 2;
+  string vendor_code = 3;
+  repeated Size sizes = 4;
+}
+message GetProductsResponse {
+  repeated Product products = 1;
 }