BatchSpanProcessor doesn't cancel after export timeout duration

[srikanthccv]

Python implementation of BatchSpanProcessor doesn't cancel the export call after the EXPORT_TIMEOUT duration. An end user can pass a value or set an env var OTEL_BSP_EXPORT_TIMEOUT to instruct how long processor can wait for export before cancelling. Python implementation doesn't use it and waits for exporter to return https://github.com/open-telemetry/opentelemetry-python/blob/main/opentelemetry-sdk/src/opentelemetry/sdk/trace/export/__init__.py#L330-L336. Looking at the go implementation for comparison https://github.com/open-telemetry/opentelemetry-go/blob/main/sdk/trace/batch_span_processor.go#L213 it does cancel after export timeout. I am wondering if there was any deliberate reason for not doing (there is no easy way to achieve it in python?).

[github-actions]

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