[feature-request] Android - Add the ability to customize the Publisher

[cunninghamzac]

Feature Request

Description

There is currently no way to turn the camera flashlight on or off while video is publishing. Since two clients can't access the camera at the same time, there needs to be a way to configure a custom capturer that can open the camera. The custom capturer would then be able to turn the camera flashlight on or off.

Proposal
Provide a way to hook into the Publisher.Builder to further configure the Publisher as needed.

This is what I ended up doing that fulfilled our requirements: master...cunninghamzac:configure-publisher

I then call

OTSessionManager.setPublisherBuilderConfig(new MySuperAwesomePublisherConfigImpl(this));

in the MainApplication.onCreate(). The PublisherConfig implementation then sets a custom capturer on the Publisher.Builder.