spqlios-allocators

[ngama75]

We need to go through some required refactoring of the current allocators.

• [x] expose dynamic sizeof functions for all current private structures:
  • [x] uint64_t bytes_of_vec_znx_dft(module, size);
  • [x] uint64_t bytes_of_vec_znx_big(module, size);
  • [x] uint64_t bytes_of_svp_ppol(module);
  • [x] uint64_t bytes_of_vmp_pmat(module, nrows, ncols);
• [x] expose a convienience void* spqlios_alloc(size) and spqlios_free(void* ptr) that allocate 64-bytes aligned data.
• [x] expose a convenience shortcuts new_xxx(module, dims) and delete_xxx(module_dims) for each private structure above
• [x] delete the old alloc_xxx for the above private structures, as well as std_free.