C++ API

Are there any plans to provide a C++ API? I am not suggesting to replace the C API, but add one additionally. Especially using RAII makes it easier and safer to use. Maybe even some performance gains are possible? E.g. providing a templated version of `hs_scan` to not have to pass a function pointer.

Start by reviewing the existing C API, especially hs_scan, and determine how a C++ API could add RAII without replacing the current interface. The issue does not identify files, tests, or a settled design, so done would require agreeing on scope and API behavior before implementation.

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