Add logging for FlowExecutionErrorEvent in Async Failures Addition plugin

[jongpie]

Salesforce has a platform event object called FlowExecutionErrorEvent that generates events for errors in screen flows (autolaunched flows are not supported unfortunately). It seems conceptually similar to Apex's BatchApexErrorEvent, so this would be a nice fit for the Async Failures Additions plugin.

I'm not sure exactly where some of the fields on FlowExecutionErrorEvent would map to in Nebula Logger, but hopefully some of the existing Flow-specific fields on LogEntryEvent__e and LogEntry__c can be reused.

[jamessimone]

@jongpie thanks! I'll aim to tackle this next week

[jamessimone]

Oops the week went by and I knew I had forgotten something. I may be able to take a stab at this this weekend!

[jongpie]

No rush at all!