Compute power search config from columns

Summary: Doc: https://docs.google.com/document/d/1miofxds9DJgWScj0zFyBbdpRH5Rj0T9FqiCapof5-vU/edit#heading=h.pg8svtdjlx7

Reviewed By: antonk52

Differential Revision: D49349521

fbshipit-source-id: 49f8059bdbfbcc316b79eb633ec54d957f16548d

desktop/flipper-plugin/src/ui/PowerSearch/PowerSearchConfig.tsx

@@ -63,6 +63,5 @@ export type FieldConfig = {
 };
 
 export type PowerSearchConfig = {
-  name: string;
   fields: {[key: string]: FieldConfig};
 };