loadFlexData(/* mPropertyBag */) {
			return Promise.reject("loadFlexData is not implemented");
		}
Interface called to get the flex data, including changes and variants.

@param {object} mPropertyBag Properties needed by the connectors
@param {string} mPropertyBag.flexReference Reference of the application
@param {string} [mPropertyBag.url] Configured URL for the connector
@param {string} [mPropertyBag.cacheKey] Key which can be used to etag / cachebuster the request
@returns {Promise<Object>} Promise resolving with an object containing a flex data response

@private
@ui5-restricted SAP Web IDE (Visual Editor), UX Tools