Introduce StorageService#read(StorageConsumer)

With the old method there was no easy way to access the last modified
timestamp, so a new method is introduced following the consumer
pattern introduced with readAll(). The old read method might be
deprecated in the future.

Change-Id: Id542cd8856a2a2c194cc703c0ff352f6eeaeff10
Signed-off-by: Michael Ochmann <michael.ochmann@sap.com>
4 files changed