Migrate the etcd implementations of the operations to here

[Shiming Zhang]

kwok is a simulated k8s cluster.
which implements a subcommand to bypass apiserver and directly edit the etcd data of the simulated cluster.

• kwokctl hack get
• kwokctl hack del
• kwokctl hack put

I want to apply the same capabilities to an existing test cluster rather than a simulation cluster.
allows easier modification of test cluster data for simulation to verify control plane stability after upgrade/downgrade or chaos.

I want to add a subcommand that can directly edit the data from etcd and use it like kubectl.

[James Blair]

/assign @wzshiming