MAINT: (dtype-transfer) make copyswapn and legacy cast wrapper method

This is just a small preparation to make the code slightly more
modular, since I definitely will need to retain the wrapping for
legacy dtype `dtype->f->castfuncs` and the `dtype->f->copyswapn`,
but want more freedom to see whether I can split out the specialized
casts we use internally (since NumPy has those cast functions, but
normally never uses them).

Splitting these two out should make it easier to write a function
to support current "legacy" dtype cast functions without worrying
as much about the casts used internally for NumPy dtypes.

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