net: l2: wifi: Add support for W-Fi mode setting and selection

This change brings in support for setting various Wi-Fi modes and
enables a specific Wi-Fi interface to be also placed into a sniffer
operation via monitor mode and promiscuous mode. A raw TX- packet
Injection mode is also introduced

Signed-off-by: Vivekananda Uppunda <vivekananda.uppunda@nordicsemi.no>