Add serialization/deserialization of definitely-not-null types

^KT-26245 In Progress

compiler/testData/loadJava/compiledKotlin/annotations/types/DefinitelyNotNull.kt

@@ -0,0 +1,5 @@
+// !LANGUAGE: +DefinitelyNotNullTypeParameters
+// COMPILER_ARGUMENTS: -XXLanguage:+DefinitelyNotNullTypeParameters
+package test
+
+fun <T> foo(x: T!!, y: List<T!!>, z: (T!!) -> T!!): T!! = x

compiler/testData/loadJava/compiledKotlin/annotations/types/DefinitelyNotNull.txt

@@ -0,0 +1,3 @@
+package test
+
+public fun </*0*/ T> foo(/*0*/ x: T!!, /*1*/ y: kotlin.collections.List<T!!>, /*2*/ z: (T!!) -> T!!): T!!