Add confluent kafka installation to minimal notebook

[woop]

What this PR does / why we need it:

The current minimal Jupyter notebook doesn't work because it requires confluent_kafka to be installed.

Does this PR introduce a user-facing change?:

None

[feast-ci-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: woop

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[feast-ci-bot]

@woop: The following tests failed, say /retest to rerun them all:

Test name	Commit	Details	Rerun command
python-sdk-integration-test	6eaf9a1	link	/test python-sdk-integration-test
test-end-to-end-gcp	6eaf9a1	link	/test test-end-to-end-gcp

Full PR test history

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