Review error handling in method channels

[ricardobrg]

As a developer user, I want to have useful information about errors.

Flutter method channel handlers should call the error function and pass the error description back to the native platforms.

Since most calls are async, it should get the errors from the futures.

Acceptance criteria:
1 - Errors are passed to the native platforms through the "error" method

[ricardobrg]

Add a timeout response too.

[ricardobrg]

This issue should be an extension of tiki-deprecated/platform-cmp-trail-endpoint#289 implementation to correctly pass the error messages through the platform channels.