wiseconnect: DNS NetStack Application protocol

Origin: Silicon Labs WiseConnect SDK
License: Zlib
URL: https://github.com/siliconlabs/wiseconnect
Commit: 05ef77e82bb473fdf157d33fb9cbf6e1d9a11a9e
Version: v3.5.0-rc3
Purpose: To support the SiWx917 DNS Network
Stack Application protocol offloading, we need to
add the Silicon Labs APIs,so adding the corresponding
source files and include files

Signed-off-by: Rahul Gurram <rahul.gurram@silabs.com>

Author: ragurram26