Make progress_bar an extra feature

[yselkowitz]

This allows the 'rich' dependency, which has additional dependencies and is not available in RHEL, to be optional.

Fixes: #360

[yselkowitz]

/cc @umohnani8

[lsm5]

LGTM.

@umohnani8 @TomSweeneyRedHat it's either this or we end up moving python-rich from EPEL to RHEL proper and also own it long term which could be lot more work for us.

cc @jnovy @jwhonce

[rhatdan]

/approve /lgtm

[openshift-ci[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rhatdan, yselkowitz

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[lsm5]

@umohnani8 I think we should get a new release out with this patch.

[jnovy]

Agree for the new release ASAP @lsm5

@yselkowitz this is brilliant, thank you!

[umohnani8]

/cherry-pick release-4.8

[openshift-cherrypick-robot]

@umohnani8: new pull request created: #362

In response to [this](https://github.com/containers/podman-py/pull/361#issuecomment-1875223821): >/cherry-pick release-4.8 Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[umohnani8]

Thanks for the fix @yselkowitz! LGTM

[TomSweeneyRedHat]

Neat change @yselkowitz ! Thanks for running this down and putting it together.