Headless mode for Kotlin(except coverage)

[Hello-zoka]

Description

Implement headless mode for Kotlin, except coverage collection(it is separate issue #379)

[Hello-zoka]

PR #367 implements Kotlin support in the headless mode, except for the coverage collection part. It has to be done in a separate PR, see issue #379 . Current status(after merging #367):

• Kotlin test generation and compilation support
• Method-level generation support