export otlp InstrumentationScope attributes

[brettmc]

Send InstrumentationScope attributes and dropped attributes count.

Closes #738

[codecov]

Codecov Report

Merging #825 (1dcbadc) into main (ad3ccd8) will decrease coverage by 0.23%.
The diff coverage is 100.00%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #825      +/-   ##
============================================
- Coverage     82.82%   82.59%   -0.24%     
- Complexity     1829     1884      +55     
============================================
  Files           223      230       +7     
  Lines          4723     4900     +177     
============================================
+ Hits           3912     4047     +135     
- Misses          811      853      +42     

Flag	Coverage Δ
7.4	82.60% <100.00%> (-0.24%)	⬇️
8.0	82.62% <100.00%> (-0.24%)	⬇️
8.1	82.62% <100.00%> (-0.24%)	⬇️

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Impacted Files	Coverage Δ
src/Contrib/Otlp/MetricConverter.php	100.00% <100.00%> (ø)
src/Contrib/Otlp/SpanConverter.php	98.96% <100.00%> (+0.01%)	⬆️
src/Contrib/OtlpHttp/Exporter.php	83.67% <0.00%> (-10.33%)	⬇️
src/Contrib/ZipkinToNewrelic/Exporter.php	95.83% <0.00%> (-0.84%)	⬇️
src/Contrib/OtlpGrpc/Exporter.php	91.17% <0.00%> (-0.26%)	⬇️
src/Contrib/Newrelic/Exporter.php	96.66% <0.00%> (-0.21%)	⬇️
src/API/Baggage/Baggage.php	83.87% <0.00%> (ø)
src/API/Trace/AbstractSpan.php	0.00% <0.00%> (ø)
src/Contrib/Zipkin/Exporter.php	100.00% <0.00%> (ø)
... and 18 more

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