[TOKENIZER] Fix TODO in `srcs/get_instruction_by_extension.c`

[pablo-lamtenzan]

Operand type OT_S must not be used for srstor, xrstors, xsave, xsavec, xsaves instructions and a new memory size operand (AVL_reg_t) must be implemented to represent N bytes of data which do not have a defined size.

[pablo-lamtenzan]

Operand size: AVL_OPSZ_OTHER should be set in case of non conventional operand size.