Changes to Fetch all listing sites available to the current user.

added the new optional query request parameter limit

added the new optional query request parameter offset

added the non-success response with the status 400

added the non-success response with the status 401

added the non-success response with the status 403

added the non-success response with the status 429

added the non-success response with the status 500

added the non-success response with the status 503

api operation id ListingSites_GetMany removed and replaced with get-listingsites