* Move and rename NetPeerUtils
* Rename NetPeerUtils to NetPeerAttributes; inject instance instead of using a global var
* Rename SpanAttributeSetter to AttributeSetter (might be used to set on AttributesBuilder in the future, who knows)
* Deprecate default BaseTracer constructor: library instrumentations are supposed to inject all dependencies, the javaagent should explicitly pass globals
* fix compilation failure
* Remove peer.service customization from library instrumentation
* Make BaseTracer fields private
By making `tracer` private we're forcing all tracer implementation to use the `spanBuilder()` utility method and pass the parent context manually.
* Add constructors/methods to the base tracers to enable injecting propagators.
* formatting
* deprecate old things. convert to non-deprecated where easily possible.
* formatting, always more formatting
* Hide the context keys in the BaseTracer.
Provide the appropriate methods to get access.
* key needs to be static
* fix formatting
* more formatting, sigh
* remove an errant semicolon
Trask Stalnaker
Anuraag Agrawal
Mateusz Rzeszutek
John Watson
Nikita Salnikov-Tarnovski
Pavol Loffay