Demonstrate how to consume a rotated secret in python function

[kwiatekus]

Description

Document an example function that demonstrates how to consume a secret that is being rotated.
The sample should not go into "restarting a pod" direction, but demonstrate how this common problem can be solved programatically in the application code.

AC

• Provide a python function sample that is able to detect a changed file mounted by a volume mount and execute logic.
• STRETCH: Look into providing a convenience functions as part of our function sdk that is available in the provided programming interface

Reasons
There are no available sdks for python language that would dynamically handle changed secret file.
(@sap/xsenv is used for such use case in nodejs - unfortunately there is no equivalent for python )
Serverless users struggle to understand how to dynamically detect a changed file and execute code to reload the content (i.e restart a client that relies on the secret)

Attachments
One idea: https://github.com/samuelcolvin/watchfiles