feat(wifi): Add support for NAPT to WIFI AP

[me-no-dev]

Allows another interface's connection to be shared to the AP

Test code:

void testAP(){
  IPAddress ip(192, 168, 0, 1);
  IPAddress gw(192, 168, 0, 1);
  IPAddress mask(255, 255, 255, 0);
  IPAddress leaseStart(192, 168, 0, 2);
  IPAddress dns(8, 8, 4, 4);//or the DNS from the outgoing interface
  WiFi.softAPConfig(ip, gw, mask, leaseStart, dns);
  WiFi.softAP(WiFi.getHostname());
  while(!WiFi.AP.started()) delay(10);
  if(!WiFi.AP.enableNAPT()){
    Serial.println("Failed to enable NAPT");  
  }
}

[github-actions]

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