[opentelemetry-php-contrib] SdkBundle: OTLP exporter factory creates exporter with default values

Describe your environment Describe any aspect of your environment relevant to the problem, including your php version (php -v will tell you your current version), version numbers of installed dependencies, information about your cloud hosting provider, etc. If you're reporting a problem with a specific version of a library in this repo, please check whether the problem has been fixed on master.

Tried on both

      "open-telemetry/sdk": "1.0.0",
      "open-telemetry/symfony-sdk-bundle": "0.0.23",

and

      "open-telemetry/sdk": "dev-main",
      "open-telemetry/symfony-sdk-bundle": "dev-main",

Steps to reproduce
With the config:

otel_sdk:
    trace:
        enabled: true
        span:
          processors: simple
        exporters:
          - "otlp+grpc://otel-col:4317"
          - "otlp+http://otel-col:4318"

The OTLP span exporters are created with default values for protocol and endpoint instead of the values defined in the config.

I guess the SdkBundle is not setting the values in the config the factory is trying to access.

What is the expected behavior?
Exporters configured as I specified

What is the actual behavior?
Exporters configured with default values

Start with src/Contrib/Otlp/SpanExporterFactory.php at the protocol and endpoint lookups, then trace how the Symfony SdkBundle converts the otel_sdk exporters entries. Reproduce with the YAML configuration and compare the resulting exporters with the configured otlp+grpc and otlp+http protocols and endpoints. Done when both configured values are honored rather than defaults.