aws msk iam authent

# What is currently missing?

there is an aws msk iam authent for python https://github.com/aws/aws-msk-iam-sasl-signer-python

would you accept a PR with this feature in karapace ? Thanks

# How could this be improved?

karapace would be able to authent to an aws msk with iam

# Is this a feature you would work on yourself?

* [ ] I plan to open a pull request for this feature