Adds client info in ContextHubService dump

Example:
...
=================== CLIENTS ====================
[ContextHubClient endpointID: 0, contextHub: 0, package: android.uid.system:1000]
[ContextHubClient endpointID: 1, contextHub: 0, package: com.google.oslo]
[ContextHubClient endpointID: 2, contextHub: 0, package: com.google.oslo]
[ContextHubClient endpointID: 3, contextHub: 0, package: com.google.oslo]
[ContextHubClient endpointID: 4, contextHub: 0, package: com.google.oslo]
[ContextHubClient endpointID: 5, contextHub: 0, package: com.google.oslo]
[ContextHubClient endpointID: 6, contextHub: 0, package: com.google.oslo]
[ContextHubClient endpointID: 7, contextHub: 0, package: android.uid.systemui:10124]
[ContextHubClient endpointID: 8, contextHub: 0, intentCreatorPackage: com.google.android.apps.scone, nanoAppId: 0x476f6f676c001016]

Registration history:
12/03 14:58:17.410 - [ContextHubClient endpointID: 9, contextHub: 0, package: com.google.uid.shared:10113]
12/03 14:58:17.403 + [ContextHubClient endpointID: 9, contextHub: 0, package: com.google.uid.shared:10113]
12/03 14:58:10.295 + [ContextHubClient endpointID: 8, contextHub: 0, intentCreatorPackage: com.google.android.apps.scone, nanoAppId: 0x476f6f676c001016]
12/03 14:58:05.501 + [ContextHubClient endpointID: 7, contextHub: 0, package: android.uid.systemui:10124]
12/03 14:58:05.379 + [ContextHubClient endpointID: 6, contextHub: 0, package: com.google.oslo]
12/03 14:58:05.375 + [ContextHubClient endpointID: 5, contextHub: 0, package: com.google.oslo]
12/03 14:58:05.371 + [ContextHubClient endpointID: 4, contextHub: 0, package: com.google.oslo]
12/03 14:58:05.367 + [ContextHubClient endpointID: 3, contextHub: 0, package: com.google.oslo]
12/03 14:58:05.365 + [ContextHubClient endpointID: 2, contextHub: 0, package: com.google.oslo]
12/03 14:58:05.362 + [ContextHubClient endpointID: 1, contextHub: 0, package: com.google.oslo]
12/03 14:58:04.257 + [ContextHubClient endpointID: 0, contextHub: 0, package: android.uid.system:1000]

Bug: 121033022
Test: adb shell dumpsys contexthub
Change-Id: I33f49c1e8a144ea2818add0e0b4c52d1f5454b65