IQ1_TN Metal implementation (#46)

* iq1_tn: Metal implementation

Rquires to change the get_rows and matrix multiplication kernels
to use a dequantizer type rather than a dequantization function.
But once this is done, we can simply reuse the iq1_bn implementation.
This change will also allow to add other quantization types that
have meta data (such as a row scale) stored at the beginning of
a row (or change existing quantization types to row-wise scales).

* Some cleanup

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Co-authored-by: Iwan Kawrakow <iwan.kawrakow@gmail.com>

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