Add OpenTracing bridge implementation with BCI

[felixbarny]

No description provided.

[codecov-io]

Codecov Report

Merging #86 into master will increase coverage by 0.93%.
The diff coverage is 87.5%.

@@             Coverage Diff              @@
##             master      #86      +/-   ##
============================================
+ Coverage     74.81%   75.75%   +0.93%     
+ Complexity      868      850      -18     
============================================
  Files            94       94              
  Lines          3193     3073     -120     
  Branches        310      267      -43     
============================================
- Hits           2389     2328      -61     
+ Misses          640      611      -29     
+ Partials        164      134      -30

Impacted Files	Coverage Δ	Complexity Δ
...ic/apm/opentracing/ExternalProcessSpanContext.java	100% <ø> (ø)	3 <0> (?)
...a/co/elastic/apm/opentracing/ElasticApmTracer.java	84.21% <100%> (ø)	8 <2> (?)
.../main/java/co/elastic/apm/opentracing/ApmSpan.java	78.94% <100%> (+27.8%)	19 <5> (-17)	⬇️
.../co/elastic/apm/bci/ElasticApmInstrumentation.java	100% <100%> (ø)	4 <2> (+1)	⬆️
...main/java/co/elastic/apm/opentracing/ApmScope.java	100% <100%> (ø)	5 <1> (-1)	⬇️
.../main/java/co/elastic/apm/bci/ElasticApmAgent.java	83.58% <75%> (+2.69%)	7 <0> (ø)	⬇️
...ava/co/elastic/apm/opentracing/ApmSpanBuilder.java	81.63% <78.94%> (+1.03%)	19 <10> (-3)	⬇️
...va/co/elastic/apm/opentracing/ApmScopeManager.java	78.57% <87.5%> (-21.43%)	7 <4> (-1)
...ava/co/elastic/apm/opentracing/ElasticApmTags.java	0% <0%> (-83.34%)	0% <0%> (-1%)
... and 1 more

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