Add Sampler configuration factory

[jack-berg]

Builds on #5751, #5687, #5399, #5757, #5758 by adding logic to interpret the sampler portion of configuration schema.

[codecov]

Codecov Report

Patch coverage: 91.52% and project coverage change: -0.01% ⚠️

Comparison is base (d64793a) 91.37% compared to head (fc0a620) 91.36%.
Report is 2 commits behind head on main.

❗ Current head fc0a620 differs from pull request most recent head 886792b. Consider uploading reports for the commit 886792b to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5763      +/-   ##
============================================
- Coverage     91.37%   91.36%   -0.01%     
- Complexity     5208     5214       +6     
============================================
  Files           582      582              
  Lines         15417    15449      +32     
  Branches       1479     1488       +9     
============================================
+ Hits          14087    14115      +28     
  Misses          915      915              
- Partials        415      419       +4     

Files Changed	Coverage Δ
...extension/incubator/fileconfig/FileConfigUtil.java	50.00% <50.00%> (-10.00%)	⬇️
...extension/incubator/fileconfig/SamplerFactory.java	92.72% <92.72%> (ø)
...on/incubator/fileconfig/TracerProviderFactory.java	93.33% <100.00%> (+1.02%)	⬆️

... and 3 files with indirect coverage changes

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[mateuszrzeszutek]

Is that because the Jaeger sampler is Closeable?

[jack-berg]

Yes