Benchmark tests should send results to New Relic

[mrickard]

Benchmark tests currently send results to stdout. We should add the ability to ship results to the connect service.

If these tests are going to deliver (metric) telemetry to New Relic, we'll want to add a collector or aggregator for them, which can deliver the metrics after tests are run.

Acceptance criteria

• A collector or aggregator to receive benchmark metrics, replacing or augmenting the current ConsolePrinter
• A transport mechanism to send collected benchmark metrics to NR
• Test runs should be tagged with Node version and agent version
• Unit tests for the new collector/aggregator

Relates to #2114

[workato-integration]

https://new-relic.atlassian.net/browse/NR-255562