[datasource editor] Add description and label fields (#6927)

* Add description field for columns

* Add label for metrics

superset/assets/src/datasource/DatasourceEditor.jsx

@@ -83,6 +83,11 @@ function ColumnCollectionTable({
               label={t('Label')}
               control={<TextControl />}
             />
+            <Field
+              fieldKey="description"
+              label={t('Description')}
+              control={<TextControl />}
+            />
             {allowEditDataType &&
               <Field
                 fieldKey="type"
@@ -510,6 +515,11 @@ export class DatasourceEditor extends React.PureComponent {
         expandFieldset={
           <FormContainer>
             <Fieldset>
+              <Field
+                fieldKey="verbose_name"
+                label={t('Label')}
+                control={<TextControl />}
+              />
               <Field
                 fieldKey="description"
                 label={t('Description')}