Add controller panels for the rest of the MQTT API

[ethanjli]

We can start by having it be admin-only.

• Add controller interface in Camera panel to adjust the camera ISO & shutter speed (Add control panel for camera settings #216)
• Add controller interface in Camera panel to adjust the camera white balance (Add control panel for camera settings #216)
• Add a minimal controller interface to run data acquisition (Expose interfaces for stop-flow imaging #272)
• Add controller interface in Focus panel to adjust the focus
• Add controller interface in Camera panel to toggle the LED (note: this depends on the Planktoscope's MQTT API to expose an interface to set the LED)