octave: add transfer_function_lut1d_error_taps.m

This script plots the maximum absolute error versus number of taps, when
you are approximating a transfer function with a 1D LUT using a given
number of taps.

This shows that increasing the number of taps has diminishing returns,
especially for pure power-law inverse functions, while the approximation
error remains relatively high even for 8-bit values.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.com>
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