API: Allow setting `_get_loop` from experimental API

Get-loop as a mechanism is pretty important to be public, just the
signature should probably be modified in the future.
So we should make it public, but not hold back on replacing it
(and deprecating the current version).

To re-iterate the two main changes, I see are:
1. `move_references` is mostly unused and not good API.  I believe
   it is only used for transfer to NULL.  But that means it is only
   used as a DECREF function.  A DECREF function is special enough
   to be special though.
2. I do not like `aligned` as a single flag, I am considering if we
   should pass a power-of-two alignment, stored in a byte for each
   "operand".  In theory 4-bits of information seem enough for this.
   (3-bits only reaches `2**(2**3-1) == 128`, so 4 seems better.)

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