Make MKR NB 1500 suitable for usage with NB-IoT networks

[aentinger]

This PR allows to use IPAddress objects for connecting with the Arduino IoT Cloud. This is useful when connecting via NB-IoT networks where no DNS is provided. For using in your Arduino sketch simply perform the following replacement:

-ArduinoCloud.begin(ArduinoIoTPreferredConnection);
+ArduinoCloud.begin(ArduinoIoTPreferredConnection, DEFAULT_BROKER_SECURE_AUTH_IP_1);

[aentinger]

Successfully tested on PROD with

• MKR WiFi 1010 ✔️
• MKR 1000 ✔️
• Nano 33 IoT ✔️
• MKR GSM 1400 ✔️
  Attention: The CI here fails because we are using an ESP 8266 core != 2.5.0 for compilation. Once Arduino Create can use the latest ESP8266 core we can update Removing ESP8266 2.5.0 specific functions. ArduinoMqttClient#33 and CI should function again. @matteosuppo @facchinm Pretty please let's have the latest ESP8266 core on Create as soon as possible.
  This fixes Connect via IP adresses when DNS resolution is not available #99.

[aentinger]

@matteosuppo @facchinm any updates on getting the latest ESP8266 on Arduino Create?

[codecov-commenter]

Codecov Report

Merging #104 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #104   +/-   ##
=======================================
  Coverage   95.59%   95.59%           
=======================================
  Files          29       29           
  Lines         998      998           
=======================================
  Hits          954      954           
  Misses         44       44           

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[github-actions]

Memory usage change @9b1bd99083289c2db396ce295a3a758ed215d3b2

FQBN	Flash Usage	RAM For Global Variables
arduino:samd:mkr1000	💚 -112	🔺 +104
arduino:samd:mkrgsm1400	💚 -88	🔺 +104
arduino:samd:mkrnb1500	💚 -96	🔺 +104
arduino:samd:mkrwan1300	0	0
arduino:samd:mkrwifi1010	💚 -112	🔺 +104
arduino:samd:nano_33_iot	💚 -96	🔺 +104

[github-actions]

Memory usage change @6b03c3bf3c72e15c45c4edbfa5d967417ad7ee18

FQBN	Flash Usage	RAM For Global Variables
arduino:samd:mkr1000	💚 -112	🔺 +104
arduino:samd:mkrgsm1400	💚 -96	🔺 +104
arduino:samd:mkrnb1500	💚 -96	🔺 +104
arduino:samd:mkrwan1300	0	0
arduino:samd:mkrwifi1010	💚 -112	🔺 +104
arduino:samd:nano_33_iot	💚 -96	🔺 +104