Add semantic convention for AWS ECS Service

[bjrara]

What are you trying to achieve?
Add aws.ecs.service.name to AWS ECS resource attributes.

What did you expect to see?
ECS Service name is set to aws.ecs.service.name.

Additional context.

AWS ECS Service name is available in ECS Task Metadata API V4. aws/amazon-ecs-agent#3362

Currently, it is only detected in awsercscontainermetricsreceiver in open-telemetry/opentelemetry-collector-contrib#19744. The same detection can also be achieved in OTEL SDKs, but since it's not included in semantic conventions, the agent cannot proactively report the attribute to OTEL collector.

[lmolkova]

Related: #576 (comment)

[lmolkova]

Also #600