Add support for include-what-you-use

[Jorengarenar]

Name: include-what-you-use
URL: https://include-what-you-use.org/

As the very descriptive name of the tool suggest, the goal of IWYU is to help with #include management in C and C++ code. It figures out what headers should be actually included or not in given file. Integration with ALE probably will be similar to other clang-based tools.