Interface IPartitionManager

This function should return the correct key being used to save each user's cache information to cache - given an AccountEntity

Example: Your application may be partitioning the user's cache information for each user using the homeAccountId thus this function would return the homeAccountId from the provided AccountEntity

This function should return the correct key from which to read the specific user's information from cache.

Example: Your application may be partitioning the user's cache information for each user using the homeAccountId and thus this function would return the homeAccountId for the user in question