Add toString method to AbstractInstrument

[mkorzeniewski]

Partially resolves: #4829

I have added a toString method to the abstract class to make it available for every implementation of the AbstractInstrument. I believe the better way would be adding toString method to each the subclasses, but I would appreciate a piece of advice here.

Sample toString for the SdkDoubleHistogram is:

SdkDoubleHistogram{descriptor=InstrumentDescriptor{name=testHistogram, description=, unit=, type=HISTOGRAM, valueType=DOUBLE}}

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: mkorzeniewski / name: Michal Korzeniewski (666aaf3)

[jkwatson]

seems fine to me

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: mkorzeniewski / name: Michal Korzeniewski (6591edd)

[mkorzeniewski]

force push to the branch with author e-mail change

[codecov]

Codecov Report

Base: 90.79% // Head: 90.83% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (ffdf04e) compared to base (d1a17d7).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #4883      +/-   ##
============================================
+ Coverage     90.79%   90.83%   +0.04%     
- Complexity     4844     4857      +13     
============================================
  Files           555      556       +1     
  Lines         14438    14475      +37     
  Branches       1405     1410       +5     
============================================
+ Hits          13109    13149      +40     
+ Misses          910      908       -2     
+ Partials        419      418       -1     

Impacted Files	Coverage Δ
.../opentelemetry/sdk/metrics/AbstractInstrument.java	41.66% <100.00%> (+5.30%)	⬆️
...metry/sdk/autoconfigure/ResourceConfiguration.java	94.87% <0.00%> (-5.13%)	⬇️
.../api/baggage/propagation/W3CBaggagePropagator.java	81.63% <0.00%> (ø)
...porter/otlp/trace/OtlpGrpcSpanExporterBuilder.java	100.00% <0.00%> (ø)
...er/otlp/metrics/OtlpGrpcMetricExporterBuilder.java	100.00% <0.00%> (ø)
...r/otlp/http/trace/OtlpHttpSpanExporterBuilder.java	100.00% <0.00%> (ø)
...er/otlp/logs/OtlpGrpcLogRecordExporterBuilder.java	100.00% <0.00%> (ø)
...lp/http/metrics/OtlpHttpMetricExporterBuilder.java	100.00% <0.00%> (ø)
...lp/http/logs/OtlpHttpLogRecordExporterBuilder.java	100.00% <0.00%> (ø)
...emetry/api/baggage/propagation/PercentEscaper.java
... and 5 more

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