Add documentation of how custom runtime function (python) in Amplify Gen 2, can interact with Amplify Data (just like in typescript functions)

[sofferor]

Describe the content issue:
In this PR:
aws-amplify/amplify-backend#1602
Custom functions runtime was added to Amplify Gen 2.
The docs about it are in:
https://docs.amplify.aws/nextjs/build-a-backend/functions/custom-functions/#python

Can you also please add documentation about how a Python function can interact with the Amplify Data?
For example how to create/update/read/delete a table in Amplify Gen 2 Data.

In a typescript function, according to this docs:
https://docs.amplify.aws/nextjs/build-a-backend/functions/examples/create-user-profile-record/
It's possible to interact with Amplify Data using the "client" object:

Is it possible to do something similar in a python function? (if yes, can you please 🙏 provide example)

If not, in a typescript function it's also possible to interact with the Amplify Data with GraphQL (as you mentioned) like this:

Can you please 🙏 provide an example of how to do this in a python Amplify function?