(#455) Revert removing confidence property from OptionalSearchParameters

Author: s1hofmann

lib/optionalsearchparameters.class.ts

@@ -8,11 +8,13 @@ export class OptionalSearchParameters<PROVIDER_DATA_TYPE> {
   /**
    * {@link OptionalSearchParameters} class constructor
    * @param searchRegion Optional {@link Region} to limit the search space to
+   * @param confidence Optional confidence value to configure image or text match confidence
    * @param abort An {@link AbortSignal} to cancel an ongoing call to `waitFor`
    * @param providerData Optional data that gets passed onto the provider implementation
    */
   constructor(
     public searchRegion?: Region | Promise<Region>,
+    public confidence?: number,
     public abort?: AbortSignal,
     public providerData?: PROVIDER_DATA_TYPE
   ) {}