Implement httpx instrumentation support #156
Description
An OpenTelemetry HTTPX instrumentation exists: https://github.com/open-telemetry/opentelemetry-python-contrib/tree/main/instrumentation/opentelemetry-instrumentation-httpx
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An OpenTelemetry HTTPX instrumentation exists: https://github.com/open-telemetry/opentelemetry-python-contrib/tree/main/instrumentation/opentelemetry-instrumentation-httpx