Use the pip amazon-appflow-custom-connector-sdk package on the example #21
Description
I noticed that on the python appflow custom connector example, the SDK is used from the code of the repo rather than as a dependency.
It would be nice like to use the SDK pip package as a dependency rather than having together the code of the sdk + custom connector. In that way, if the SDK is upgraded, the devloper will need only to update the requirements file rather than copy&paste the new code.