feat: add new methods to allow get/set list of custom attributes from entry

[yurem]

Description

• In order to simplify work on issue feat: convert date/boolean values to DB specifc format before calling ORM layer #1215 ORM shopuld provide utility methods to allow work with custom attributes

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Identified code changes

Persistence layer should provide new methods:

       Class<?> getCustomAttributesListItemType(Object entry, AttributesList attributesList,
			String propertyName);

	List<AttributeData> getAttributeDataListFromCustomAttributesList(Object entry, AttributesList attributesList,
			String propertyName);
	List<Object> getCustomAttributesListFromAttributeDataList(Object entry, AttributesList attributesList,
			String propertyName, Collection<AttributeData> attributes);

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[yurem]

implemented