Initialize class dup/clone before calling initialize_dup/initialize_clone

Previously, you could override the class initialize_dup/initialize_clone
method and the class hierarchy would not be set correctly inside the
method before calling super.

This removes Module#initialize_copy, and instead makes Object#dup/clone
call the underlying C function (rb_mod_init_copy) before calling the
appropriate initialize_dup/initialize_clone method.

This results in the following fixes:

* The appropriate initialize_dup method is called (dup on a class
  will respect superclass initialize_dup).

* Inside class initialize_dup/initialize_clone/initialize_copy,
  class ancestor hierarchy is correct.

* Calling singleton_class inside initialize_dup no longer raises
  a TypeError later in dup.

* Calling singleton_class.ancestors inside initialize_dup no
  longer results in missing ancestors.

Fixes [Bug #21538]

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