Logs API: hide or rename std_to_otel function to convert python logging severity to otel severity

[lmolkova]

std_to_otel function is public.

opentelemetry-python/opentelemetry-api/src/opentelemetry/_logs/severity/__init__.py

Lines 106 to 115 in f639606

	def std_to_otel(levelno: int) -> SeverityNumber:
	"""
	Map python log levelno as defined in https://docs.python.org/3/library/logging.html#logging-levels
	to OTel log severity number as defined here: https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/logs/data-model.md#field-severitynumber
	"""
	if levelno < 10:
	return SeverityNumber.UNSPECIFIED
	if levelno > 53:
	return SeverityNumber.FATAL4
	return _STD_TO_OTEL[levelno]

opentelemetry-python/opentelemetry-api/src/opentelemetry/_logs/__init__.py

Line 58 in f639606

"std_to_otel",

Consider hiding it, moving to SDK closer to LoggingHandler or renaming to convert_log_level or something more descriptive.

Part of open-telemetry/community#1751