sizeof(WaitSet) cannot be determined at compile time in c-binding

In iceoryx_binding_c/include/iceoryx_binding_c/types.h the struct "iox_ws_storage_t_" needs to know the size of the Waitset which is in the C++ Code. Currently the size is hardcoded in "do_not_touch_me" array as magic number and this needs to be avoided.
Including C++ header is not an option due to breaking dependencies.

Possible solution is maybe to use codegeneration in cmake to fill a variable at compile time and insert it into the struct.

This applies also to the other arrays in types.h