[php-src] Issue #8554: Chage FFI::cdef() return FFI\CDef object

Issue: https://github.com/php/php-src/issues/8554 Author: chopins ### Description Now, FFI::cdef() return a FFI object, then through FFI object call C function. The above reasons cause some method support call by statically and non-statically, and these method will need exclude in zend_ffi_handlers.get_method. if C DLL has same name function will not be call, or add new FFI method must insert to execlude list. So suggest FFI::cdef() return object of other class, For example use FFI\CDef instead of FFI object. FFI\CDef is not construrct and extend in PHP code, Similarly FFI\CData. Through FFI\CDef of zend_ffi_handlers.get_method will call C function. and FFI non-statically method add one paramter receive FFI\CDef object