sync tikv configmap and start script in controller

[aylei]

#1121

Sync the tikv configmap and start-script in controller, an example about syncing these could be found here:

Note:

• Rolling-update of configmap should be controlled via a strategy field.
• An integration test case (e2e) should be added to verify this change will not rolling-update the tikv statefulset created before if there's no change in tidbcluster spec.
• Unlike pump, configuration of TiKV must have schema, because TiKV is written in rust, it's hard to import the schema of TiKV's configuration directly, maybe maintain a go copy is an acceptable idea, for example, hackathon team plainboring did so : https://github.com/plainboring/config_client/blob/master/pkg/tikv/config.go