Allow IP collection to be easily turned on and off in config

[rivkahstandig3636]

Keep the default IP collection what it is now, but allow the ability to turn IP collection off in the config.

@ArturMoczulski This is a top priority.

[rokob]

See https://github.com/rollbar/pyrollbar/pull/262/files for the canonical way that I have been doing this across all of the other SDKs