[Feature] bind delete_keys parameter on tf_client update_priority

[cmarlin]

Hello,
For sample efficiency approach I need to randomly reevaluate target policy/value and update it.
The client API allow to remove such datas but not the tf_client. As the core functions allow it I suggest to bind parameters.
Thanks,

[acassirer]

Hey @cmarlin,

Thanks a lot for contributing to Reverb and sorry for the long delay. If you could take a look at the merge conflicts that have developed then I'd be more than happy to accept this PR!

Thanks,
Albin