Prototype: Implement vikunja memObj to abstract input and output data of algorithm

[SimeonEhrig]

The vikunja::memObj should allow:

• Using alpaka::Buf and alpaka::View native instead raw pointers
• reduce the number of arguments of algorithm (instead begin pointer and size only use a input memObj, which contains the size, dimension ...)
• Allow to implement only one function definition for an algorithm and support different types for the input and output memory, such alpaka::Buf, alpaka::View, raw pointer, std::Iterator ...
• Allow to add extra type information, such the memory visibility
  • allows to implement a static compile time check, if the used accelerator can access the memory, e.g. if the memory is on the GPU, if you want to use the GPU for calculation
  • improve interface of algorithm through type deduction