Use fully qualified class names in codegen util methods

[Damtev]

Description

We have some compilation errors while generating tests for user's code when we need to generate our hardcoded util methods (like deepEquals, etc) that use classes with simple name collisions (like kotlin.Array and java.lang.reflect.Array). To fix this problem, we need to always use a fully qualified name for all classes used in util methods (except classes from the java.lang package).

To Reproduce

Steps to reproduce the behavior:

The easiest way to reproduce is by generating Kotlin test that has to use both arraysDeepEquals and createArray util methods.

Expected behavior

Correct test without compilation errors.

Actual behavior

Compilation errors because of simple name collisions (kotlin.Array and java.lang.Array).