Add read/write performance test for AppFuse.

The perforamnce test read from/write to 10MB data to AppFuse file 100
times.

Test: adb shell am instrument -w com.android.mtp.perftests/android.support.test.runner.AndroidJUnitRunner
Bug: 31982374
Change-Id: I8f78ee43d8078d7f1098249b28491cb43b5f3bef