Add ContextPropagators configuration factory

[jack-berg]

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

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (3b1c6d9) 91.35% compared to head (0fc330d) 91.37%.
Report is 2 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #5758      +/-   ##
============================================
+ Coverage     91.35%   91.37%   +0.01%     
- Complexity     5196     5208      +12     
============================================
  Files           581      582       +1     
  Lines         15391    15417      +26     
  Branches       1474     1479       +5     
============================================
+ Hits          14061    14087      +26     
  Misses          915      915              
  Partials        415      415              

Files Changed	Coverage Δ
.../fileconfig/OpenTelemetryConfigurationFactory.java	100.00% <100.00%> (ø)
...nsion/incubator/fileconfig/PropagatorsFactory.java	100.00% <100.00%> (ø)

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