public static Map<String, Object> getSubProperties(PropertySources propertySources, String prefix) {

		return getSubProperties(propertySources, new PropertySourcesPropertyResolver(propertySources), prefix);
	}
Get prefixed {@link Properties}.

@param propertySources {@link PropertySources}.
@param prefix          the prefix of property name.
@return Map
@see Properties
spring-cloud-alibaba-starters/spring-cloud-alibaba-commons/src/main/java/com/alibaba/cloud/commons/context/support/PropertySourcesUtils.java