address: Add introspection-friendly to_string_dup
nice_address_to_string expects an already-allocated string, which is not
great for introspection. Adds nice_address_to_string_dup, which does the
same thing, but returns a newly allocated string.
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nice_address_to_string expects an already-allocated string, which is not
great for introspection. Adds nice_address_to_string_dup, which does the
same thing, but returns a newly allocated string.