Rate-limit and bound all data structures

[garvankeeley]

1. Ensure that all json files have bounded size
2. Limit the amount of uploads permitted in a single session.
3. Rate-limit the I/O calls

[garvankeeley]

Currently, the lib is intended for
• once-per-session Core Ping
• user interaction rate limited (i.e. primarily user tap-initiated) UI event telemetry.

Any high-rate telemetry, or telemetry on app events not bounded by user interaction rate (which run the risk of being high-rate), is out-of-scope for the first version.