feat(bottlecap): Update Step Functions trace extraction (#591)

Update trace context creation from Step Function execution
* Utilize `State.RetryCount` and `Execution.RedriveCount` for parent ID generation to prevent retry span collisions (backwards compatible)
* Support multi-level trace merging for arbitrary depth in Step Function and Lambda traces
* Align with datadog-agent#34264 for improved trace propagation

Author: avedmala