Zigbee flash storage refactor

[s-hadinger]

Description:

Flash storage of Zigbee devices information (addresses, names, endpoints) is refactored to enable saving of device configuration (light channels, PIR timeout...). The new format is also slightly smaller.

V1 to v2 transformation is done automatically. But if you then revert to a previous version, you will lose device info, and need to use ZbProbe.

You can also save each device information with ZbStatus2 <x> with <x> starting at 1 and up to the number of devices. You can later restore with ZbRestore <json> using the json output of ZbStatus2.

Checklist:

• The pull request is done against the latest dev branch
• Only relevant files were touched
• Only one feature/fix was added per PR.
• The code change is tested and works on Tasmota core ESP8266 V.2.7.4.5
• The code change is tested and works on core ESP32 V.1.12.2
• I accept the CLA.

NOTE: The code change must pass CI tests. Your PR cannot be merged unless tests pass