Remove event logger

[brettmc]

Event Logger has been removed from spec, in favour of Logger.EmitEvent. We have deprecated EventLogger in main, this removes it from 2.x and adds EmitEvent as its replacement.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.50%. Comparing base (176b10a) to head (7bd811e).
Report is 2 commits behind head on 2.x.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.x    #1480      +/-   ##
============================================
+ Coverage     68.44%   68.50%   +0.05%     
+ Complexity     2885     2866      -19     
============================================
  Files           428      422       -6     
  Lines          8775     8708      -67     
============================================
- Hits           6006     5965      -41     
+ Misses         2769     2743      -26     

Flag	Coverage Δ
8.2	68.39% <100.00%> (?)
8.3	68.32% <100.00%> (?)
8.4	68.36% <100.00%> (?)
8.5	68.36% <100.00%> (-0.09%)	⬇️

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

Files with missing lines	Coverage Δ
src/API/Globals.php	100.00% <100.00%> (ø)
src/API/Instrumentation/CachedInstrumentation.php	100.00% <ø> (ø)
src/API/Instrumentation/Configurator.php	100.00% <ø> (ø)
src/API/Instrumentation/ContextKeys.php	100.00% <ø> (ø)
.../Config/SDK/ComponentProvider/OpenTelemetrySdk.php	0.00% <ø> (ø)
...rovider/Propagator/TextMapPropagatorCloudTrace.php	0.00% <ø> (ø)
src/Config/SDK/_register.php	0.00% <ø> (ø)
src/Contrib/Otlp/LogsConverter.php	93.97% <100.00%> (+1.47%)	⬆️
src/SDK/Logs/Exporter/ConsoleExporter.php	100.00% <100.00%> (ø)
src/SDK/Sdk.php	100.00% <ø> (ø)
... and 2 more

... and 13 files with indirect coverage changes

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[brettmc]

Worth mentioning and discussion, is that in this PR I've removed some methods etc related to event logger. The spec really wants us to not ever make breaking changes to the API. However:

It should be documented that the newly added methods are in Development and are subject to breaking changes.

The event logger was development stability, just not documented as such by us. I think we're allowed to remove non-stable features in a breaking way...