Integrate kbatch

[iameskild]

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds a feature)
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TODO:

• Finish integrating dask-gateway
• Enable kbatch to run in insecure mode (no SSL cert)
• Add overrides mapping
• Add documentation

cc @Adam-D-Lewis @costrouc

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[iameskild]

@costrouc @Adam-D-Lewis I think this PR is ready for a final review :)