[rapidcheck] Add initial support for RapidCheck (#4605)

* Add initial support for RapidCheck

Create a portfile for the C++ property-based testing library RapidCheck.
This port is relatively straight forward but there are a couple of caveats:
 * The current port uses a branch from a fork that I modified as the CMake installation logic had some problems.
   The library was almost exclusively used by being added as a subfolder so the CMake export machinery was probably not well tested.
 * The changes are going to get merged into the main repository eventually and then it would be possible to change where the source
   code is downloaded.

I am unaware when the main RapidCheck library maintainer will accept my pull request, so it is better to have this library in VCPKG
sooner, rather than later.

* Update the RapidCheck portfile to download the library sources for the main repository

 * Since the maintainer of RapidCheck very quickly merged the required CMake modifications
   to enable the proper installation of the library, it is better to now use the official
   repository's master branch.
 * Change the versioning of the library to be based on the date of the git reference chosen
   since rapid check does not have an explicit versioning scheme.

* Update rapidcheck and modify configuration step

* [rapidcheck] Tidy

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