Add Jaeger Propagator

[weslenteche]

• Added Jaeger Progagator with tests.

Fixes #1187.

[codecov]

Codecov Report

Merging #1188 (c764b98) into main (d376566) will increase coverage by 0.17%.
The diff coverage is 97.64%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1188      +/-   ##
============================================
+ Coverage     84.29%   84.47%   +0.17%     
- Complexity     2196     2225      +29     
============================================
  Files           282      285       +3     
  Lines          6245     6330      +85     
============================================
+ Hits           5264     5347      +83     
- Misses          981      983       +2     

Flag	Coverage Δ
7.4	83.13% <97.64%> (+0.19%)	⬆️
8.0	84.40% <97.64%> (+0.18%)	⬆️
8.1	84.53% <97.64%> (+0.17%)	⬆️
8.2	84.53% <97.64%> (+0.17%)	⬆️
8.3	84.53% <97.64%> (+0.17%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
...on/Propagator/Jaeger/JaegerDebugFlagContextKey.php	100.00% <100.00%> (ø)
...K/Metrics/MetricExporter/ConsoleMetricExporter.php	0.00% <ø> (ø)
...sion/Propagator/Jaeger/JaegerBaggagePropagator.php	96.55% <96.55%> (ø)
...c/Extension/Propagator/Jaeger/JaegerPropagator.php	98.07% <98.07%> (ø)

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[weslenteche]

@Nevay and @brettmc, could you review it again?

[brettmc]

https://packagist.org/packages/open-telemetry/extension-propagator-jaeger

[brettmc]

@weslenteche thanks for your contribution! As a follow-up, could you scan the docs on opentelemetry.io to see if we need to mention this propagator there?

[weslenteche]

You're welcome, I'll check how other languages mention this propagator and if necessary I'll add the documentation.