Add correlation trail

[ttrig]

tldr; Build a "trail" for audited events to make it possible to figure out the order of events without relying on occured_at.

// Service A (incoming request without correlation headers)
audit($user)->foo(); # trail = null ("root" event)
JobWithCorrelation::dispatch(); # audited events get trail null
Http::withCorrelation()->post('service-b'); # contains X-Correlation-ID

// Service B
audit($user)->bar(); # trail = "abcd"
JobWithCorrelation::dispatch(); # audited events get trail "abcd"
Http::withCorrelation()->post('service-c'); # contains X-Correlation-ID and X-Correlation-Trail

// Service C
audit($user)->baz(); # trail = "abcd:efgh"
JobWithCorrelation::dispatch(); # audited events get trail "abcd.efgh"

• demo
• test in prod