Mqttv5 connect

[Pooja-Toshniwal]

MQTTV5 Connect and Connack

Description

Introduced a config variable MQTT_VERSION_5_ENABLED, which enables the users to use version 5 of MQTT. To support the new properties of connect and connack packet introduced in the version 5, I have modified the existing data structures and functions, and added some new functions. For unit testing I have modified the existing folder structure of test to create a separate folder for v5.

Test Steps

Checklist:

• [x] I have tested my changes. No regression in existing tests.
• [x] I have modified and/or added unit-tests to cover the code changes in this Pull Request.

Related Issue

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[Pooja-Toshniwal]

/bot run uncrustify

[Pooja-Toshniwal]

/bot run uncrustify