Feature Request - Support multiple logging outputs.

[gavinelder]

Summary

Currently fleet has support for multiple logging outputs as of #2282 it will be Options are filesystem, firehose, kinesis, pubsub, and stdout`, at this time these are mutually exclusive however there may be situations where implementations may benefit from having multiple outputs such as the following.

• Log to disk to be consumed by log-exporter / ES and log to Firehose / S3 for long term historical reference.
• Log to firehose for analysis and log to stdout for real time debugging

Ideal behaviour

Ideally osquery_status_log_plugin would accept an array of outputs and fleet would support writing to these.