[rkcommon] add new port

[Neumann-A]

• Changes comply with the maintainer guide
• The name of the port matches an existing name for this component on https://repology.org/ if possible, and/or is strongly associated with that component on search engines.
• Optional dependencies are resolved in exactly one way. For example, if the component is built with CMake, all find_package calls are REQUIRED, are satisfied by vcpkg.json's declared dependencies, or disabled withCMAKE_DISABLE_FIND_PACKAGE_Xxx None
• The versioning scheme in vcpkg.json matches what upstream says.
• The license declaration in vcpkg.json matches what upstream says.
• The installed as the "copyright" file matches what upstream says.
• The source code of the component installed comes from an authoritative source.
• The generated "usage text" is accurate. See docs/examples/adding-an-explicit-usage.md for context.
• The version database is fixed by rerunning ./vcpkg x-add-version --all and committing the result.
• Only one version is in the new port's versions file.
• Only one version is added to each modified port's versions file.

[MonicaLiu0311]

The usage test passes:

rkcommon provides CMake targets:

    # this is heuristically generated, and may not be correct
    find_package(rkcommon CONFIG REQUIRED)
    target_link_libraries(main PRIVATE rkcommon::rkcommon)

[BillyONeal]

I manually checked that the SHA in here is not affected by #29288

[BillyONeal]

Thanks for the new port @Neumann-A !
Thanks for checking the usage @MonicaLiu0311 !