Tracing: add service value annotations

[pankajagrawal16]

Is your feature request related to a problem? Please describe.
Original issue: https://github.com/awslabs/aws-lambda-powertools-python/issues/850

When troubleshooting a larger app, service annotation would've made it easier to slice the service map in X-Ray. Similarly, ColdStart annotation is only added when there is a cold start - having false would be great to quickly analyze sampled requests where cold start happened vs warm starts.

Describe the solution you'd like
Include service annotation, Service, if value is defined

Describe alternatives you've considered
Manually create that as part of my function

Additional context

[pankajagrawal16]

Added in https://github.com/awslabs/aws-lambda-powertools-java/releases/tag/v1.9.0