JMH jar pack all sources

[DotSpy]

If u are using classes in JMH from /main/java/* u will get ClassNotFoundException this PR is fixing it

[codecov-io]

Codecov Report

Merging #839 into master will decrease coverage by 0.24%.
The diff coverage is 73.91%.

@@             Coverage Diff              @@
##             master     #839      +/-   ##
============================================
- Coverage     79.11%   78.87%   -0.25%     
- Complexity      786      788       +2     
============================================
  Files           104      105       +1     
  Lines          2811     2845      +34     
  Branches        269      273       +4     
============================================
+ Hits           2224     2244      +20     
- Misses          483      495      +12     
- Partials        104      106       +2

Impacted Files	Coverage Δ	Complexity Δ
...in/java/io/opentelemetry/metrics/DefaultMeter.java	71.18% <ø> (-1.49%)	25 <0> (-6)
...elemetry/trace/propagation/BinaryTraceContext.java	100% <100%> (ø)	12 <1> (ø)	⬇️
...a/io/opentelemetry/sdk/metrics/LongCounterSdk.java	65.71% <100%> (+7.09%)	5 <4> (+2)	⬆️
...c/main/java/io/opentelemetry/trace/TraceState.java	87.09% <100%> (ø)	30 <2> (?)
...ntelemetry/sdk/trace/RecordEventsReadableSpan.java	90.3% <100%> (-1.22%)	44 <0> (-1)
...io/opentelemetry/sdk/metrics/DoubleMeasureSdk.java	65.71% <100%> (+7.09%)	5 <4> (+2)	⬆️
...in/java/io/opentelemetry/sdk/metrics/MeterSdk.java	86.66% <100%> (+21.96%)	10 <6> (+2)	⬆️
.../main/java/io/opentelemetry/trace/DefaultSpan.java	76% <100%> (ø)	18 <0> (ø)	⬇️
...ava/io/opentelemetry/sdk/trace/SpanBuilderSdk.java	93.87% <100%> (ø)	36 <0> (ø)	⬇️
.../main/java/io/opentelemetry/trace/SpanContext.java	100% <100%> (ø)	8 <2> (ø)	⬇️
... and 13 more

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[DotSpy]

Example for running jmhJar https://github.com/open-telemetry/opentelemetry-java/pull/815/files

and after fixing jmh.gradle

[jkwatson]

good fix. I hadn't run into this yet, but I probably would have very soon!