WiFiClientSecure: add loadCACert function (#3610)
WiFiClientSecure: add loadCACert function (#3610)

Added loadCACert function
lrmoreno007/Arduino,me-no-dev/Arduino,wemos/Arduino,Adam5Wu/Arduino,Juppit/Arduino,sticilface/Arduino,Lan-Hekary/Arduino,Juppit/Arduino,esp8266/Arduino,sticilface/Arduino,me-no-dev/Arduino,hallard/Arduino,Lan-Hekary/Arduino,sticilface/Arduino,jes/Arduino,wemos/Arduino,wemos/Arduino,lrmoreno007/Arduino,esp8266/Arduino,sticilface/Arduino,jes/Arduino,wemos/Arduino,wemos/Arduino,me-no-dev/Arduino,Adam5Wu/Arduino,esp8266/Arduino,jes/Arduino,Lan-Hekary/Arduino,esp8266/Arduino,esp8266/Arduino,Juppit/Arduino,Adam5Wu/Arduino,hallard/Arduino,Juppit/Arduino,Adam5Wu/Arduino,me-no-dev/Arduino,me-no-dev/Arduino,lrmoreno007/Arduino,jes/Arduino,hallard/Arduino,jes/Arduino,Lan-Hekary/Arduino,Lan-Hekary/Arduino,lrmoreno007/Arduino,Adam5Wu/Arduino,sticilface/Arduino,hallard/Arduino,hallard/Arduino,Juppit/Arduino,lrmoreno007/Arduino