[HIPIFY][HIP][feature] Target hipification to a specific HIP version

[emankov]

• Introduce the HIP target version (like for CUDA, though it is implemented by clang) under an option, assuming the default equals HIP_LATEST
• Take into account the HIP target version during hipification and for emitting warnings and errors

[emankov]

The decision was made to abandon targeting hipification to a specific HIP version task. Instead, one can use a corresponding HIPIFY release to target a particular HIP version.