MAINT: Implement new casting loops based on NEP 42 and 43

switch to using new casting as default to run full CI

Initialize casting to silence compile warnings only...

BUG: As my comment even said, out_needs_api is caller-initialized

so I shouldn't init it to 0, it might disable api again.

Simplify tests again, it seems unnecessar to go this complex

Simplify `#if` as the variable should always be defined

TST: Add more tests (and some related fixes)

This fixes a few small things (i.e. the decref loop can be NULL
and checking for writeable was incorrect in the private API).

Mostly adds new tests for some internal API as well as for the copy
of the auxiliar data. The nditer test however also is a heavyweight
tests for the general multistep casting

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