Updated sampling result name

[euniceek]

This PR updates the names of Sampling result for consistency, closing #1648

The changes have been made following these specifications:
open-telemetry/opentelemetry-specification#938
open-telemetry/opentelemetry-specification#956

Changed from:

• NOT_RECORD

• RECORD

• RECORD_AND_SAMPLED

Changed to:

• DROP

• RECORD_ONLY

• RECORD_AND_SAMPLE

[jkwatson]

Thanks!

[anuraaga]

Just small doc suggestion for consistency, thanks!

[codecov]

Codecov Report

Merging #1661 into master will increase coverage by 0.05%.
The diff coverage is 91.89%.

@@             Coverage Diff              @@
##             master    #1661      +/-   ##
============================================
+ Coverage     86.62%   86.67%   +0.05%     
- Complexity     1398     1402       +4     
============================================
  Files           163      164       +1     
  Lines          5524     5545      +21     
  Branches        552      554       +2     
============================================
+ Hits           4785     4806      +21     
  Misses          542      542              
  Partials        197      197              

Impacted Files	Coverage Δ	Complexity Δ
...in/java/io/opentelemetry/metrics/DefaultMeter.java	100.00% <ø> (ø)	15.00 <0.00> (ø)
...in/java/io/opentelemetry/sdk/OpenTelemetrySdk.java	100.00% <ø> (ø)	3.00 <0.00> (ø)
.../java/io/opentelemetry/sdk/internal/TestClock.java	100.00% <ø> (ø)	8.00 <0.00> (ø)
...telemetry/sdk/resources/EnvAutodetectResource.java	100.00% <ø> (ø)	4.00 <0.00> (ø)
...io/opentelemetry/sdk/metrics/MeterSdkProvider.java	100.00% <ø> (ø)	5.00 <0.00> (ø)
.../io/opentelemetry/sdk/metrics/data/MetricData.java	100.00% <ø> (ø)	2.00 <0.00> (ø)
...metry/sdk/metrics/export/IntervalMetricReader.java	87.69% <ø> (ø)	4.00 <0.00> (ø)
...o/opentelemetry/sdk/metrics/view/Aggregations.java	76.78% <ø> (ø)	4.00 <0.00> (ø)
.../io/opentelemetry/sdk/trace/TracerSdkProvider.java	100.00% <ø> (ø)	11.00 <0.00> (ø)
...io/opentelemetry/sdk/trace/config/TraceConfig.java	95.00% <ø> (ø)	6.00 <0.00> (ø)
... and 13 more

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