refactor otlp exporter

[brettmc]

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Remove OtlpHttp and OtlpGrpc exporters, and replace with Otlp\SpanExporter and Otlp\MetricExporter using a transport to manage grpc and http/protobuf complexity. Allow setting signal and protocol on transport factories (particularly for grpc, which uses signal to look up grpc method) Adding BC for OtlpHttp and OtlpGrpc, which will still fail but with a more helpful message. Fix failing examples. Send user-agent header with otlp exports. Allow otlp http/json

[codecov[bot]]

Codecov Report

Merging #838 (0bc286e) into main (ba98992) will decrease coverage by 0.09%. The diff coverage is 39.39%.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #838      +/-   ##
============================================
- Coverage     80.90%   80.80%   -0.10%     
+ Complexity     1973     1951      -22     
============================================
  Files           246      248       +2     
  Lines          5173     5122      -51     
============================================
- Hits           4185     4139      -46     
+ Misses          988      983       -5     

Flag	Coverage Δ
7.4	80.29% <39.39%> (-0.10%)	:arrow_down:
8.0	80.80% <39.39%> (-0.10%)	:arrow_down:
8.1	80.94% <39.39%> (-0.10%)	:arrow_down:

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

Impacted Files	Coverage Δ
src/API/Common/Signal/Signals.php	0.00% <0.00%> (ø)
src/Contrib/Grpc/GrpcTransportFactory.php	53.33% <ø> (-2.23%)	:arrow_down:
src/Contrib/Otlp/MetricExporter.php	38.70% <ø> (+38.70%)	:arrow_up:
src/Contrib/Otlp/ProtobufSerializer.php	0.00% <ø> (ø)
src/Contrib/Otlp/Protocols.php	0.00% <0.00%> (ø)
src/Contrib/Otlp/SpanExporterFactory.php	0.00% <0.00%> (ø)
...DK/Common/Export/Stream/StreamTransportFactory.php	0.00% <0.00%> (ø)
src/SDK/Resource/Detectors/Process.php	100.00% <ø> (ø)
src/SDK/Common/Export/Http/PsrTransportFactory.php	72.22% <16.66%> (-27.78%)	:arrow_down:
src/Contrib/Grpc/GrpcTransport.php	53.12% <75.00%> (+3.12%)	:arrow_up:
... and 8 more

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[bobstrecansky]

LGTM sans the conflict.

[erdemkose]

Great improvement. Thanks for the effort. I want to try it on a small project to see it in a real-world environment. Do you plan to create a new tag (0.0.16) with the changes?

[brettmc]

Hi @erdemkose good idea, we'll get one out soon.