Enable 'Search Wishlist' functionality

This functionality in particular allows user to search a specific wish list with a purpose to access/modify it. The user can then alter/modify the specific wishlist according as per personal requirements.

Implementation steps involved:

1. This functionality makes use of the Form and Search APIs to include the following components for executing a functional and effective search:
   • Search submit button: To execute the required search.
   • Search results list: Displaying the expected search results.
   • Search text box (textbox): If there are keywords, check for the user, wish list title, or address matches.
2. Additionally, the ​Database API​ would involve the following facets:
   • $db = \Drupal::database()​: Gets the connection object for the specified database key and target.
   • $query->condition(db_or()
     ->condition('u.name','%'.$keywords.'%','LIKE')
     ->condition('w.title','%'.$keywords.'%','LIKE')
     ->condition('w.address','%'.$keywords.'%',
     'LIKE'))​​ :
     makes three queries and returns a new DatabaseCondition.
   • $data=$db→select('uc_wishlist','wid')→fields('wid')→execute()​: Checks if wish list is not private.
3. The ​Configuration API would be used to configure the fields.