Use class canonical name for PARTIAL_WAKE_LOCK tag (#24673)

Summary:
When acquiring the `PARTIAL_WAKE_LOCK`, Android requires a tag to identify the source, normally the class name. This tag will show on dumpsys call and Google Play developer console.

`getSimpleName` will work fine as long as not enable ProGuard, in my case, it transformed the class name to just `"c"`, and I take my half day to find where the `c` comes from.

`getCanonicalName` will add the package path, which is more friendly for developers.

Later we can even let the developer choose the tag name, but this will require API break changes.

[Android] [Changed] - Use class canonical name for PARTIAL_WAKE_LOCK tag
Pull Request resolved: #24673

Differential Revision: D15164306

Pulled By: cpojer

fbshipit-source-id: fd65f9e5250c180b0053940b17877fe36af5d48b

ReactAndroid/src/main/java/com/facebook/react/HeadlessJsTaskService.java

@@ -75,7 +75,7 @@ public static void acquireWakeLockNow(Context context) {
         Assertions.assertNotNull((PowerManager) context.getSystemService(POWER_SERVICE));
       sWakeLock = powerManager.newWakeLock(
         PowerManager.PARTIAL_WAKE_LOCK,
-        HeadlessJsTaskService.class.getSimpleName());
+        HeadlessJsTaskService.class.getCanonicalName());
       sWakeLock.setReferenceCounted(false);
       sWakeLock.acquire();
     }