AbstractBoundInstrument refcounts and keeps the state of mapped.

[bogdandrutu]

Split from #831

[codecov-io]

Codecov Report

Merging #842 into master will increase coverage by 0.26%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #842      +/-   ##
============================================
+ Coverage     79.25%   79.51%   +0.26%     
- Complexity      792      798       +6     
============================================
  Files           105      105              
  Lines          2858     2861       +3     
  Branches        269      268       -1     
============================================
+ Hits           2265     2275      +10     
+ Misses          491      487       -4     
+ Partials        102       99       -3

Impacted Files	Coverage Δ	Complexity Δ
...telemetry/sdk/metrics/AbstractBoundInstrument.java	100% <100%> (+45.45%)	8 <8> (+5)	⬆️
...a/io/opentelemetry/sdk/metrics/LongCounterSdk.java	67.56% <100%> (ø)	4 <1> (ø)	⬇️
...io/opentelemetry/sdk/metrics/DoubleCounterSdk.java	67.56% <100%> (ø)	4 <1> (ø)	⬇️
...a/io/opentelemetry/sdk/metrics/LongMeasureSdk.java	67.56% <100%> (ø)	4 <1> (ø)	⬇️
...io/opentelemetry/sdk/metrics/DoubleMeasureSdk.java	67.56% <100%> (ø)	4 <1> (ø)	⬇️
...elemetry/opentracingshim/SpanContextShimTable.java	96.42% <0%> (+7.14%)	8% <0%> (+1%)	⬆️

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