Add query functionalities to query all of crates

Once the application called Context.getCrateDir(), the crates root
directory is also created. The application can mkdir directory under the
crates root. Each child directory in crates root is one crate.

Each crate information is descibed by CrateInfo. CrateInfo contains
the following information.
* Label:
    It is used to display text to the users.
    Default is the folder name.
* Expiration:
    When the system needs more space. The system will clean the files
    in the crates according to the expired or not.
    Default is 0.

Test: atest \
    CtsOsTestCases:android.os.storage.cts.CrateInfoTest \
    CtsOsTestCases:android.os.storage.cts.StorageCrateTest \
    CtsOsTestCases:android.os.storage.cts.StorageStatsManagerTest

Bug: 141660526

Change-Id: Icdc8123c481ef7c5b4fd68ffcfd334ffbfc9d655