Stability improved with pbuf_take instead of memcpy

Default ssid and password are 'ssid' and 'password', respectively which the firmware will try to connect once uploaded to the pi pico w board.

Recompile with network relative ssid and password required to connect to different network.

pico-sdk lib folder updated to the following submodules and tested:-

Submodule path 'lib/btstack': checked out '272986f17af35a67815ab20897f6c91e710322a4'
Submodule path 'lib/cyw43-driver': checked out 'b7195d8f931a22bdb2da2699da14eeb3ca8a26f7'
Submodule path 'lib/lwip': checked out 'b413b040936f48d4cd9ed632ac579542c710efae'
Submodule path 'lib/mbedtls': checked out 'ea982e39a186c628a6bd3cf5671cbaf89a669c6f'
Submodule path 'lib/tinyusb': checked out 'ae364b1460b91153cd94b4b0303eeda6419ff1d1'