* Remove tracer name configuration from spring-boot-autoconfigure
* Use OpenTelemetry wherever it makes sense
* Refactor @WithSpan advice since it made no sense before
* Rename @EnableOpenTelemetryTracing to @EnableOpenTelemetry (it won't be just tracing in the future)
* And add a getOpenTelemetry() method to InstrumentationExtension & InstrumentationSpecification
* Update instrumentation/spring/spring-boot-autoconfigure/src/main/java/io/opentelemetry/instrumentation/spring/autoconfigure/aspects/WithSpanAspectTracer.java
Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>
* Code review comments
Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>