[SYS] Multiple connections management (#1947)

Enable the management of different connections at runtime with a set of certs for each.
Add parameters to the WiFi Manager onboarding, client certificates, and certificate validation

platformio.ini

@@ -84,7 +84,6 @@ extra_configs =
 ;default_envs = nodemcuv2-rf-cc1101
 ;default_envs = nodemcuv2-somfy-cc1101
 ;default_envs = manual-wifi-test
-;default_envs = nodemcuv2-mqtt-fw-test
 ;default_envs = rf-wifi-gateway
 ;default_envs = nodemcuv2-rf2
 ;default_envs = nodemcuv2-rf2-cc1101