isUninstallExtensionSupported
 Checks if the uninstallExtension  method is supported by the given contract.
Example
Parameters
Returns
 A promise that resolves to a boolean indicating if the uninstallExtension  method is supported.
 Checks if the uninstallExtension  method is supported by the given contract.
 A promise that resolves to a boolean indicating if the uninstallExtension  method is supported.