HTTPS support on Pico!

It appears the MQTT client connection is rejected by the server. The TLS connection has been made, but hasn't finished authenticating yet (sd->connecting is still false, but the connected event is emitted). The mqtt connect should not be called until the TLS client authentication process is completed/authorized by the server.

Here's the output without the delay and some notes:

Connecting with TLS...
Loading the CA root certificate...
Loading certificate file: "certs/rootCA.pem"
Loading the Client certificate...
Loading certificate file: "certs/cert.pem"
Loading the Client Key...
Loading certificate file: "certs/key.pem"
Performing the SSL/TLS handshake...
TLS connected  ------------------->(logged in my TLS connected event handler)
Client connected  ----------------->(logged in MQTT module connected event)
Verifying peer X.509 certificate...   --->(logged ~line 530 of network.c)
MQTT client disconnected   --------->(logged in MQTT end event)

Maybe add an authorized event that fires after the authentication process? Or delay the connected event in this scenario?