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

services/java/com/android/server/SystemServer.java

@@ -1456,6 +1456,10 @@ public final class SystemServer implements Dumpable {
             mSystemServiceManager.startService(KeyChainSystemService.class);
             t.traceEnd();
 
+            t.traceBegin("StartBinaryTransparencyService");
+            mSystemServiceManager.startService(BinaryTransparencyService.class);
+            t.traceEnd();
+
             t.traceBegin("StartSchedulingPolicyService");
             ServiceManager.addService("scheduling_policy", new SchedulingPolicyService());
             t.traceEnd();