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As the comments in the diff say: it's a fairly sizable footgun for
users to need to consider whether they expect the pointer form or
the bare form when inspecting what an `ipld.Link` interface contains:
so, let's just remove the choice.

There's technically no reason for the Link.Load method to need to be
attached to the pointer receiver other than removing this footgun.
From the other side, though, there's no reason *not* to make it
attached to the pointer receiver, because any time a value is assigned
to an interface type, it necessarily heap-escapes and becomes a pointer
anyway.  So, making it unconditional and forcing the pointer to be
clear in the user's hands seems best.