Add event bucket support to Adapter (Rust SDK)

[bhelx]

We need to add an eventbucket for trace events in the rust sdk. Similar to how we do this in the Go SDK: https://github.com/dylibso/observe-sdk/blob/main/go/bucket.go

we should use this in datadog first.

[neuronicnobody]

Complete for DataDog Adapter but can be used for others as well