Added MetricReader customizer for AutoConfiguredOpenTelemetrySdkBuilder

[asafm]

Added an ability to customize a MetricReader created at AutoConfiguredOpenTelemetrySdkBuilder by allowing to specify a BiFunction which accepts a MetricReader and the configuration and returns a MetricReader. This allows the user to create a new MetricReader either based on the one created by AutoConfiguredOpenTelemetrySdkBuilder or a completely new one.

[asafm]

This is the second step for #6179, since without you currently won't be able to modify a Prometheus reader created by AutoConfiguredOpenTelemetrySdkBuilder - the modification is about calling setAllowedResourceAttributesFilter(Predicate<String> resourceAttributesFilter) added in that PR - this method allows you specify which attributes to copy from the Resource attributes into each exported UTS labels.

[asafm]

@jack-berg This is the 2nd step required for me to use it in Apache Pulsar.

[codecov]

Codecov Report

Attention: Patch coverage is 93.33333% with 1 lines in your changes are missing coverage. Please review.

Project coverage is 91.06%. Comparing base (6afb816) to head (c2c1487).

Files	Patch %	Lines
...autoconfigure/spi/AutoConfigurationCustomizer.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #6231   +/-   ##
=========================================
  Coverage     91.06%   91.06%           
- Complexity     5695     5699    +4     
=========================================
  Files           621      621           
  Lines         16667    16679   +12     
  Branches       1707     1709    +2     
=========================================
+ Hits          15177    15188   +11     
- Misses          997      998    +1     
  Partials        493      493           

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[asafm]

@jack-berg Fixed all comments.

[jack-berg]

Just one last comment about a possible extra dependency.

[asafm]

@jack-berg Fixed