Add a EventTypeAutoCreateAsync method

[Cali0707]

Problem
Currently, all the event type auto creation calls are blocking, increasing the end to end latency in the system. We should move these calls to being async in a separate goroutine.

I investigated this and ran into issues with the context being provided to the EventTypeAutoCreate function: even if you copy the context, when a parent context is cancelled the child is cancelled too. As far as I can see, there are two main approaches to solving this:

1. Create our own implementation of the context interface which supports a new context without the parent cancelling it
2. Wait until we have upgraded to go 1.21+ and use the context.WithoutCancel method which was recently added.

I think approach 2 is best, and we should aim to tackle this after upgrading our go version in the future.

Persona:
Which persona is this feature for?

Exit Criteria
A unit test showing that the event type is created in a non-blocking way

Time Estimate (optional):
1

Additional context (optional)
Add any other context about the feature request here.

[pierDipi]

@matzew @dsimansk what do you think about this?

[dsimansk]

I like the #2 option. Go 1.21 is just of the door now. IMO it's possible to upgrade for next or next+1 release.

I'd probably try to aim this enhancement to the Beta graduation/enabled by default phase. Once we got some feedback for the eventtype-auto-create from the field.