feat(search): support for field exclusion

Author: Supamiu

src/model/xivapi-search-filter.ts

@@ -1,5 +1,5 @@
 export interface XivapiSearchFilter {
     column: string;
-    operator: '=' | '>' | '<' | '<=' | '>=' | '|=';
-    value: string | number | string[] | number[];
+    operator: '=' | '>' | '<' | '<=' | '>=' | '|=' | '!';
+    value?: string | number | string[] | number[];
 }