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

* [SDK] Add namespace parameter to KatibClient

Co-authored-by: andreafehrman <[email protected]>
Co-authored-by: ryanrusson <[email protected]>

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

Co-authored-by: Andrey Velichkevich <[email protected]>

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Co-authored-by: andreafehrman <[email protected]>
Co-authored-by: ryanrusson <[email protected]>
Co-authored-by: Andrey Velichkevich <[email protected]>