run-vcpkg@v10 - support for manifest mode (vcpkg.json) as first class citizen

Changes:

• Redesigned the inputs of run-vcpkg in order to support vcpkg's manifest mode: vcpkg.json.
• Simplified and minimized the set of inputs of the action. Now the default is to not run vcpkg, but to let it run at run-cmake execution time (i.e. when CMake is generating project files).
• Automatic hash on vcpkg.json for contributing to the key of vcpkg's artifact caching.
• Automatic computation of primary and fallback keys for maximizing reuse of the cache.