fix(Android): failure when faking sealed classes

[vitorhugods]

Fixes:

• valueOf causes NPE on Android for sealed classes #87

Issue

When running Android Instrumented tests with parameters that are sealed classes on Android or in older JVMs, a NullPointerException is thrown.

How to reproduce

1. Run an Android emulator or connect a physical Android device
2. ./gradlew :shared:connectedDebugAndroidTest

Cause

When running on Android or in older JVMs, the JVM functions Class$isSealed and Class$getPermittedSubclasses do not exist, so the sealed class will fall onto the abstract case in makeValueOf.

Solution

Use Kotlin Reflect to read the Kotlin metadata from the class instead of trying to just use these functions that may not exist during runtime.

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Known issue

While investigating this, I also noticed that the test ValueOfTests.makeValueOfReturnsOtherStuff fails when trying to get valueOf<AbstractParameter>(). I've created #91 to handle the abstract class case.