fix(napi,napi-derive): ffi lifetime and pointer sound issues

[cathy-sjh]

1、The following code will make an error, the Box::into_raw(empty struct) will return 0x1

#[napi]
pub struct ZeroStruct;

#[napi]
impl ZeroStruct {
  #[napi(constructor)]
  pub fn new() -> Self {
    ZeroStruct
  }
}

#[napi(catch_unwind)]
pub fn return_zero_struct() -> ZeroStruct {
  ZeroStruct
}

2、The ownership of the CString passed to cffi will be taken in map function. When passed to cffi, the ctring memory has already been released