Werk #13415: Add kubernetes filter

Component	Setup
Title	Add kubernetes filter
Date	Mar 30, 2022
Level	Trivial Change
Class	New Feature
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b5 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This adds filters for kubernetes piggyback hosts. It's now possible to filter for cluster, namespace, node, deployment, daemonset and statefulset.

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