apply logging spec updates

[brettmc]

Removing include_trace_context parameter
Set ObservedTimestamp on emit if not already set
Rename logRecord to emit

[codecov]

Codecov Report

Merging #977 (e58d7e0) into main (a06e5e4) will decrease coverage by 0.45%.
The diff coverage is 76.23%.

❗ Current head e58d7e0 differs from pull request most recent head 12ed8fe. Consider uploading reports for the commit 12ed8fe to get more accurate results

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #977      +/-   ##
============================================
- Coverage     82.95%   82.50%   -0.45%     
  Complexity     2165     2165              
============================================
  Files           281      283       +2     
  Lines          6195     6197       +2     
============================================
- Hits           5139     5113      -26     
- Misses         1056     1084      +28     

Flag	Coverage Δ
7.4	81.17% <76.23%> (-0.45%)	⬇️
8.0	82.44% <76.23%> (-0.47%)	⬇️
8.1	82.56% <76.23%> (-0.47%)	⬇️
8.2	82.56% <76.23%> (-0.47%)	⬇️

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

Impacted Files	Coverage Δ
...I/Common/Instrumentation/CachedInstrumentation.php	83.33% <0.00%> (ø)
src/API/Logs/NoopLogger.php	100.00% <ø> (ø)
src/SDK/Metrics/Data/Exemplar.php	0.00% <0.00%> (ø)
...SDK/Metrics/Stream/AsynchronousMetricCollector.php	0.00% <0.00%> (ø)
.../SDK/Metrics/Stream/SynchronousMetricCollector.php	0.00% <0.00%> (ø)
src/SDK/Logs/ReadableLogRecord.php	91.89% <80.00%> (-2.71%)	⬇️
src/SDK/Metrics/Stream/MetricAggregator.php	96.29% <80.00%> (-3.71%)	⬇️
src/API/Logs/EventLogger.php	100.00% <100.00%> (ø)
src/API/Logs/NoopLoggerProvider.php	100.00% <100.00%> (ø)
src/SDK/Logs/Logger.php	100.00% <100.00%> (ø)
... and 14 more

... and 1 file with indirect coverage changes

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[pdelewski]

Is it not part of the spec?

[brettmc]

It was removed in the last couple of days. The changes in this PR are referenced in open-telemetry/opentelemetry-specification#2911