grpc OTLPSpanExporter max retry timeout is not configurable

The exponential backoff in the grpc version of the OTLPSpanExporter has its max retry timeout hard coded, meaning there is no way to configure the retry behaviour of this exporter. The value should be configurable like with the http version of the OTLPSpanExporter.

https://github.com/open-telemetry/opentelemetry-python/blob/2ddb076454c46a2656e594508b370cd6766bcece/exporter/opentelemetry-exporter-otlp-proto-grpc/src/opentelemetry/exporter/otlp/proto/grpc/exporter.py#L271-L293

	def _export(
	self, data: Union[TypingSequence[ReadableSpan], MetricsData]
	) -> ExportResultT:
	# After the call to shutdown, subsequent calls to Export are
	# not allowed and should return a Failure result.
	if self._shutdown:
	logger.warning("Exporter already shutdown, ignoring batch")
	return self._result.FAILURE

	# FIXME remove this check if the export type for traces
	# gets updated to a class that represents the proto
	# TracesData and use the code below instead.
	# logger.warning(
	# "Transient error %s encountered while exporting %s, retrying in %ss.",
	# error.code(),
	# data.__class__.__name__,
	# delay,
	# )
	max_value = 64
	# expo returns a generator that yields delay values which grow
	# exponentially. Once delay is greater than max_value, the yielded
	# value will remain constant.
	for delay in _create_exp_backoff_generator(max_value=max_value):

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grpc OTLPSpanExporter max retry timeout is not configurable #4331

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