[SDK] Add namespace parameter to KatibClient (#2183)

* [SDK] Add namespace parameter to KatibClient

Co-authored-by: andreafehrman <andrea.k.fehrman@vanderbilt.edu>
Co-authored-by: ryanrusson <ryan.russon@gmail.com>

* Update sdk/python/v1beta1/kubeflow/katib/api/katib_client.py

Co-authored-by: Andrey Velichkevich <andrey.velichkevich@gmail.com>

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Co-authored-by: andreafehrman <andrea.k.fehrman@vanderbilt.edu>
Co-authored-by: ryanrusson <ryan.russon@gmail.com>
Co-authored-by: Andrey Velichkevich <andrey.velichkevich@gmail.com>