Kapt: Add DUMP_DEFAULT_PARAMETER_VALUES flag (KT-29355)

Put initializers on fields when corresponding primary constructor
  parameters have a default value specified. The new behavior
  is available under the new 'DUMP_DEFAULT_PARAMETER_VALUES' flag.

Note that this doesn't affect regular functions with default parameter
  values, as well as primary constructor parameters without a
  'val' or 'var' keyword.

plugins/kapt3/kapt3-compiler/testData/kotlinRunner/DefaultParameterValues.kt

@@ -0,0 +1,8 @@
+// DUMP_DEFAULT_PARAMETER_VALUES
+
+package test
+
+@Anno
+class User(val name: String = "John", age: Int = 18)
+
+internal annotation class Anno