FunctionAXPY should store Function as std::shared<Function> instead of Function*

When creating FunctionAXPY from python this creates a seg fault if the Function is not stored.

class MyClass:
  def my_function(self):
      f = Function(Q)
      self.axpy = FunctionAXPY([1.0,f])

  def my_other_function(self):
     #this will seg fault unless you save f above with self._f = f
     self.axpy.call_something_that_uses_pointer_to_stored_function()

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