Tune / finalize the queue's batch and timing parameters

[faec]

Right now the shipper's internal Beats memory queue uses fixed defaults for its initialization parameters (batch minimum event count and timeout). These are placeholders to bootstrap the shipper, and should be replaced once things are fleshed out enough to run a comparison of the options. This may involve removing those parameters entirely as we rework internal batch handling, but if not, we should decide on a baseline we're happy with and expose configuration hooks if appropriate.

[jlind23]

@faec @leehinman this issue hasn't been update for a while, is it still relevant? If yes, we should probably add it to one of our upcoming sprints

[leehinman]

yes, very relevant