* Next attempt to extract common logic from instrumentations.
I tried to reduce code repetition in DB client instrumentations, jdbc and mongo ones. This time I experimented with another approach, different from HttpServerTracer. Namely, I have extracted that common `startSpan` method into `DatabaseClientDecorator` itself. The idea is still the same as before, but I wanted to see if we can migrate by smaller steps, reusing much of the existing code and just incrementally reducing public API.
* Extracted separate Tracer after all
* More explicit call depth handling
* Fix format
* More reusable method overloads
* Update gradle dependencies and module name
* Replace Tracer.withSpan() with currentContextWith()
* Update inject to 0.3.0
* Update extract to 0.3.0
* More updates
* Remove distributedcontext package refs
* Update OpenTelemetry API interoperability
* No need to call setNoParent()
setParent(SpanContext.getInvalid()) should give the same result.
* Update dependency version
* Change getTracerFactory to getTracerProvider
* Update some imports
* Change put to set
* Fix up bridge
* Update package names
* Update test SpanProcessor
* Remove null conditionals around setAttribute
* Update shading
* Update span context extraction
* Rename hibernate modules
* Update tracer name
* Change from gradle inheritance to composition
This will make it possible to have empty "grouping" modules, e.g.
instrumentation:hibernate.
* Introduce empty hibernate grouping module
Trask Stalnaker
Helen Y
Alexey Zhokhov
Nikita Salnikov-Tarnovski
Anuraag Agrawal
Tyler Benson
John Bley