samples: Provide x-nucleo-iks01a2 shield sample

This sample is made to demonstrate use of x-nucleo-ik01a2 shield.
It requires a board with Arduino i2c where it can be plugged on.
The sample has been tested on Nucleo F401RE board.

Signed-off-by: Armando Visconti <armando.visconti@st.com>
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