Improving and modularizing the kclient package

[johnmcollier]

We recently delivered the Kclient package in odo (#2458), and there are already PRs which are delivering into it (e.g. #2509)

On the odo dev call today, we discussed how we should avoid having kclient becoming one big, monolithic package, like occlient is today. We also discussed that it might be a good idea at some point, start to look at replacing usage of occlient with kclient, and that a modular kclient would help in this regard

Opening this issue for further discussion and eventual implementation.

CC @girishramnani @kadel

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[openshift-ci-robot]

@openshift-bot: Closing this issue.

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