bluetooth: common: Add BT hexdump

Added BT alisa for dumping binary data to the logg.
The macro will be useful for BT as reworked settings supports r/w of
raw data - which will be widely leveraged in bluetooth storage alignment
to reworked settings.

Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>