Add Base2 prefix to internal exponential histogram classes

[jack-berg]

Followup to #5143.

[codecov]

Codecov Report

Base: 91.05% // Head: 91.05% // No change to project coverage 👍

Coverage data is based on head (ca903f3) compared to base (92403b0).
Patch coverage: 95.23% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #5179   +/-   ##
=========================================
  Coverage     91.05%   91.05%           
  Complexity     4869     4869           
=========================================
  Files           548      548           
  Lines         14373    14373           
  Branches       1378     1378           
=========================================
  Hits          13087    13087           
  Misses          893      893           
  Partials        393      393           

Impacted Files	Coverage Δ
...egator/DoubleBase2ExponentialHistogramBuckets.java	69.44% <90.00%> (ø)
...java/io/opentelemetry/sdk/metrics/Aggregation.java	100.00% <100.00%> (ø)
...l/aggregator/Base2ExponentialHistogramIndexer.java	100.00% <100.00%> (ø)
...tor/DoubleBase2ExponentialHistogramAggregator.java	94.66% <100.00%> (ø)
...nal/view/Base2ExponentialHistogramAggregation.java	100.00% <100.00%> (ø)
...ava/io/opentelemetry/sdk/internal/RateLimiter.java	94.11% <0.00%> (-5.89%)	⬇️
...nternal/state/DefaultSynchronousMetricStorage.java	93.10% <0.00%> (+1.72%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.