Added BinderCallsStatsService

It tracks binder calls into the system server and reports
statistics about CPU time spent per call on multiple dimensions,
e.g. uid or call description.

Usage: dumpsys binder_calls_stats
Overhead: ~0.5% per binder call (if enabled)

Test: manual
Bug: 75318418
Change-Id: I13b854f67f8fd1c9f985b8e45f74dcba2e73b9cb

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

@@ -703,6 +703,11 @@ public final class SystemServer {
             mWebViewUpdateService = mSystemServiceManager.startService(WebViewUpdateService.class);
             traceEnd();
         }
+
+        // Tracks cpu time spent in binder calls
+        traceBeginAndSlog("StartBinderCallsStatsService");
+        BinderCallsStatsService.start();
+        traceEnd();
     }
 
     /**