Unify and add more attributes for OpenTelemetry signals

Currently, WildFly's support for configuring instance-wide attributes (e.g. service name and instance ID) for OpenTelemetry signals in the WildFly config file is very limited:

• The opentelemetry subsystem, which deals with traces, allows the service name to be set, but nothing else.
• The micrometer subsystem, which deals with metrics, doesn't allow anything to be set.

It would be helpful if:

• The instance ID (service.instance.id in OTel's Resource Semantic Conventions) could be set. IMO it should default to jboss.node.name if not explicitly set.
• Arbitrary attributes could be set. I don't have an exact use case in mind, but the flexibility could be useful.
• All of these attributes could be set in one place, so they are guaranteed to be consistent across all types of signals.