Auth Support For Controllers

[AdheipSingh]

• Starting with Basic Auth
• Pinot's Tenant Controller, Schema Controller and Table Controller should be able to authenticate to controller API.

[AdheipSingh]

• Added example.

Pinot Controller should lookup for ENV variables

• CONTROL_PLANE_USERNAME and CONTROL_PLANE_PASSWORD , these can be passed as secrets as env's.

[AdheipSingh]

30