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a2b56dc5 - WindowCovering Implementation, LevelControl and Docs update (#844)

WindowCovering Implementation, LevelControl and Docs update (#844) * Enhance WindowCovering overrides * adds constrain checks for LiftValue and TiltValue * adds feature specific conformance information to Type/´and EndProductType attributes as per 1.2 specs * ExtensionInterface for LevelControl * WindowCovering implementation and test usage * WindowCovering chip tests * Update Migration docs * Add $Changed/$Changing * Add own Behaviors * Add custom storage * Add own state * Changelog * parallelize chip tests core/app * finalize * upgrade action * add note --------- Co-authored-by: lauckhart <greg@lauckhart.com>