Add BinaryTransparencyService as new SystemService.

Bug: 197684182

Created a new system service that aggregates information about:
1) signed partitions on device
2) APEXs installed on device
3) Modules installed on device

Introduces new adb shell commands as below:
adb shell cmd transparency get image_info [-a]
adb shell cmd transparency get apex_info [-v]
adb shell cmd transparency get module_info [-v]

Test: Built and tested locally on a bramble - the device boots.
Issuing adb shell commands as above provides correct outputs.

Change-Id: I2cae1bd794456688779c70c65b3f5ec8bcd7c6b3