Minimize public surface area of OpenTracingShim

[jack-berg]

Related to #4911. Trimming down the public API surface area of OpenTracingShim.

OpenTracingShim contains several different factory methods allowing users to create Tracer shims using various combinations of GlobalOpenTelemetry, OpenTelemetry, TracerProvider, and Tracer. Simplified to just two methods, which becomes the total public API surface area of the entire module:

// Create using tracer provider and propagator from an OpenTelemetry instance
io.opentracing.Tracer createTracerShim(OpenTelemetry);
// Create using specific tracer provider, text map propagator, and http propagator
io.opentracing.Tracer createTracerShim(TracerProvider, TextMapPropagator textMapPropagator, TextMapPropagator httpPropagator);

If a user wants to use the global, just call createTracerShim(GlobalOpenTelemetry.get()).

This allows the removal of OpenTracingPropagators and OpenTracingPropagatorsBuilder, which was just a wrapper for a TextMapPropagator and http TextMapPropagator.

cc @carlosalberto

[codecov]

Codecov Report

Base: 91.06% // Head: 91.04% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (0d37484) compared to base (b8f7a87).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5110      +/-   ##
============================================
- Coverage     91.06%   91.04%   -0.02%     
+ Complexity     4887     4874      -13     
============================================
  Files           551      549       -2     
  Lines         14462    14435      -27     
  Branches       1390     1390              
============================================
- Hits          13170    13143      -27     
  Misses          893      893              
  Partials        399      399              

Impacted Files	Coverage Δ
...opentelemetry/opentracingshim/OpenTracingShim.java	100.00% <100.00%> (ø)
.../io/opentelemetry/opentracingshim/Propagation.java	88.23% <100.00%> (ø)
...a/io/opentelemetry/opentracingshim/TracerShim.java	78.12% <100.00%> (ø)

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[jkwatson]

You had me at "minimize public surface area"