Add category products query and update endpoints

src/Protobufs/BackOffice.BFF.Products.Protobuf/Protos/products.proto

@@ -73,6 +73,19 @@ service ProductsContract
       body: "*"
     };
   };
+
+  rpc GetProductsForCategory(GetProductsForCategoryRequest) returns (GetProductsForCategoryResponse){
+    option (google.api.http) = {
+      get: "/GetProductsForCategory"
+    };
+  };
+
+  rpc UpdateCategoryProducts(UpdateCategoryProductsRequest) returns (google.protobuf.Empty){
+    option (google.api.http) = {
+      post: "/UpdateCategoryProducts"
+      body: "*"
+    };
+  };
 }
 
 message ImageFileModel
@@ -269,3 +282,26 @@ message UpdateProductCategoriesRequest
   int64 product_id = 1;
   repeated int64 category_ids = 2;
 }
+
+message CategoryProductItem
+{
+  int64 id = 1;
+  string title = 2;
+  bool selected = 3;
+}
+
+message GetProductsForCategoryRequest
+{
+  int64 category_id = 1;
+}
+
+message GetProductsForCategoryResponse
+{
+  repeated CategoryProductItem items = 1;
+}
+
+message UpdateCategoryProductsRequest
+{
+  int64 category_id = 1;
+  repeated int64 product_ids = 2;
+}