Default Custom Event Harvest Increase from 10,000 to 30,000

[mirackara]

To help our customers see more of the custom events they're producing, the default Custom Events reservoir limit has been increased from 10,000 events per minute to 30,000 events per minute.

[RichVanderwal]

We're thinking this needs to be customer configurable, adding a setting here:

go-agent/v3/newrelic/config.go

Lines 69 to 74 in 06c801d

	CustomInsightsEvents struct {
	// Enabled controls whether RecordCustomEvent will collect
	// custom analytics events. High security mode overrides this
	// setting.
	Enabled bool
	}