dispose method Null safety
Removing an object from memory. Must be called manually.
Implementation
void dispose() {
  if (_isDisposed) return;
  var exception = _getException();
  var destructor = _dll_handle.lookupFunction<_Context_Destruct_c, _Context_Destructor_dart>(_context_namespace + 'destroy');
  destructor(this._impl, exception);
  tdvCheckException(exception, _dll_handle);
  _isDisposed = true;
}