`dx kb` should request server to execution

[mrgoonie]

Is your proposal related to a problem? Please describe.
dx kb is now using kubectl at the client, lead to authentication step, and also need to install kubectl.

Describe the solution you'd like
With only dx installed, we can access to kubernetes cluster and use kubectl via server-side.

Additional context

• Easier to manage access permissions
• No kubectl installation required at the client
• Security enhanced

[mrgoonie]

Working on it too