Fix spring-boot-autoconfigure configuration and rename properties

[mateuszrzeszutek]

Current spring-boot-autoconfigure configuration naming scheme is very different from what we use in SDK/javaagent: https://github.com/open-telemetry/opentelemetry-java-instrumentation/blob/main/instrumentation/spring/spring-boot-autoconfigure/README.md#configuration-properties

Everything starts with opentelemetry.trace.*, some properties (like opentelemetry.trace.exporters.jaeger.servicename) do not exist anymore, there's even no way to configure the Resource.

We should use the same property names that we use in SDK or javaagent, e.g.:

• otel.traces.* for tracer config;
• otel.instrumentation.<name>.enabled to enable manual instrumentations (@WithSpan advice, HTTP clients, etc);
• And add otel.resource.attributes support so that service.name is properly set.

[trask]

there's also been some discussion in the past of transferring ownership of spring boot autoconfiguration to the spring cloud sleuth team / repo

[zeitlinger]

Fixed by #10292