Violations while using strict mode

[Shahroz16]

Describe the bug
When strict mode is enabled, there are couple of storage access on main thread violations.

To Reproduce
Add the following code snippet to application file in kotlin-android-app sample app

        // Thread policy - detects network calls, disk reads, custom slow calls on main thread
        StrictMode.setThreadPolicy(new StrictMode.ThreadPolicy.Builder()
                .detectNetwork()   // Detect network calls on main thread
                .detectDiskReads() // Detect disk reads on main thread
                .detectDiskWrites() // Detect disk writes on main thread
                .detectCustomSlowCalls() // Detect custom slow calls marked with StrictMode.noteSlowCall()
                .penaltyLog()      // Log violations to LogCat
                .penaltyDialog()   // Show dialog for violations (useful for debugging)
                .build());

You will see couple of violations, all due to accessing storage in main thread at start up.

StrictMode policy violation; ~duration=30 ms: android.os.strictmode.DiskReadViolation
                                                                                                    	at android.os.StrictMode$AndroidBlockGuardPolicy.onReadFromDisk(StrictMode.java:1683)
                                                                                                    	at libcore.io.BlockGuardOs.access(BlockGuardOs.java:74)
                                                                                                    	at libcore.io.ForwardingOs.access(ForwardingOs.java:128)
                                                                                                    	at android.app.ActivityThread$AndroidOs.access(ActivityThread.java:8582)
                                                                                                    	at java.io.UnixFileSystem.checkAccess(UnixFileSystem.java:332)
                                                                                                    	at java.io.File.exists(File.java:829)
                                                                                                    	at com.segment.analytics.kotlin.core.utilities.FileUtils.createDirectory(FileUtils.kt:12)
                                                                                                    	at com.segment.analytics.kotlin.core.utilities.FileEventStream.<init>(EventStream.kt:162)
                                                                                                    	at com.segment.analytics.next.EncryptedEventStream.<init>(EncryptedEventStream.kt:25)
                                                                                                    	at com.segment.analytics.next.EncryptedStorageProvider.createStorage(EncryptedEventStream.kt:194)
                                                                                                    	at com.segment.analytics.kotlin.core.Analytics$storage$2.invoke(Analytics.kt:47)
                                                                                                    	at com.segment.analytics.kotlin.core.Analytics$storage$2.invoke(Analytics.kt:46)
                                                                                                    	at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:74)
                                                                                                    	at com.segment.analytics.kotlin.core.Analytics.getStorage(Analytics.kt:46)
                                                                                                    	at com.segment.analytics.kotlin.core.Analytics.<init>(Analytics.kt:50)
                                                                                                    	at com.segment.analytics.kotlin.core.Analytics.<init>(Analytics.kt:87)
                                                                                                    	at com.segment.analytics.kotlin.android.AndroidAnalyticsKt.Analytics(AndroidAnalytics.kt:67)
                                                                                                    	at com.segment.analytics.next.MainApplication.onCreate(MainApplication.kt:31)
                                                                                                    	at android.app.Instrumentation.callApplicationOnCreate(Instrumentation.java:1386)
                                                                                                    	at android.app.ActivityThread.handleBindApplication(ActivityThread.java:7504)
                                                                                                    	at android.app.ActivityThread.-$$Nest$mhandleBindApplication(Unknown Source:0)
                                                                                                    	at android.app.ActivityThread$H.handleMessage(ActivityThread.java:2416)
                                                                                                    	at android.os.Handler.dispatchMessage(Handler.java:107)
                                                                                                    	at android.os.Looper.loopOnce(Looper.java:232)
                                                                                                    	at android.os.Looper.loop(Looper.java:317)
                                                                                                    	at android.app.ActivityThread.main(ActivityThread.java:8705)
                                                                                                    	at java.lang.reflect.Method.invoke(Native Method)
                                                                                                    	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:580)
                                                                                                    	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:886)

Expected behavior

There should not be any DiskReadViolation on main thread.