UpdateEngineUpdateAttemptReported: add super and slot size, and free space

Additional information are important to evaluate the impact of Virtual
A/B on devices especially related to OTA take rate.
In order to find a correlation between the OTA take rate and the storage
composition, the following metrics are added to the
UpdateEngineUpdateAttemptReported:
- super_partition_size_bytes: the size of the super partition,
- slot_size_bytes: the size of the current slot, and
- super_free_space_bytes: representing the free space in the super
partition.

Bug: 154016862
Bug: 157720191
Test: m
Signed-off-by: Alessio Balsini <balsini@google.com>
Change-Id: I9a6146831a4d6254f8c4d1bfe0df9ca97ef15d34