Consolidate prop-editor and info-viewer into a unified ZooKeeper props sub-command

The ZooKeeper command group currently has two separate, overlapping tools in CommandGroups.ZOOKEEPER: `zk info-viewer` and `zk prop-editor`. Both tools deal with ZooKeeper-backed properties but are split across two commands. A user trying to view and then edit properties must switch between tools.

Introduce a new zk props sub-command that consolidates the property inspection and editing capabilities of both tools and exposes them as explicit get and set sub-operations.