Update function def model

pkg/datasource/models.go

@@ -87,6 +87,13 @@ type QueryFunction struct {
 type QueryFunctionDef struct {
 	Name          string                  `json:"name"`
 	Category      string                  `json:"category"`
+	Params        []QueryFunctionParamDef `json:"params"`
+	DefaultParams []string                `json:"defaultParams"`
+}
+
+type QueryFunctionParamDef struct {
+	Name string `json:"name"`
+	Type string `json:"type"`
 }
 
 // ReadQuery will read and validate Settings from the DataSourceConfg