[REQUEST] Add Zigbee network backup to file and restore features to tzb-zigpy-cli-tools

[Hedda]

@tube0013 Please consider adding feature options Zigbee network backup to file and restore features to tzb-zigpy-cli-tools.

This would be especially helpful to Zigbee2MQTT users for adapter migration when they have Silicon Labs and ConBee/RaspBee based Zigbee Coordinator radio dongles as the zigbee-herdsman library Z2M depends on currently only support Texas Instruments based adapters.

Zigbee2MQTT users can already manually install and use zigpy-cli to create a manual backup to file of their Zigbee network from their old Zigbee Coordinator regardless of which radio type it is based on and then restore that backup from file to a new adapter.

For example, a Zigbee network backup will allow you to migrate from a old TI CC2531 with Z-Stack Home 1.2 or an old Silabs EM35xx to a newer CC2652 or EFR32MG21 based Zigbee Coordinator without having to manually re-pair/re-join any devices. You can even migrate from older ConBee and RaspBee (deconz firmware based) adapters as long as you first upgrade their firmware.

For reference see:

• migrating coordinator from ZBDongle-E to ZBDongle-P Koenkk/zigbee2mqtt#16478
• deconz adapter/driver does not support backup and restore for ConBee/RaspBee by dresden elektronik? Koenkk/zigbee-herdsman#665
• [WIP]: EFR32 EZSP adapter implementation and test Koenkk/zigbee-herdsman#319

zigpy-cli can backup and restore Zigbee network to/from file allow Zigbee2MQTT users to backup and migrate radio types:

https://github.com/zigpy/zigpy-cli/blob/dev/README.md#network-backup

https://github.com/zigpy/zigpy-cli/blob/dev/README.md#network-restore

Note! Restoring backups using zigpy-cli automatically copy the same IEEE to a new adapter and that way the Zigbee gateway application thinks it is the same adapter, but the end user themselves would still need to manually change serial config for port, adapter (i.e. radio type), and/or baudrate in their configuration.yaml for Z2M config if they changed from for example Silicon Labs to Texas Instruments or firmware:

https://www.zigbee2mqtt.io/guide/faq/#how-do-i-migrate-from-one-adapter-to-another

https://www.zigbee2mqtt.io/guide/configuration/

PS: ZHA and Zigbee2MQTT gateway backups are not compatible even though both use "Open ZigBee Coordinator Backup Format" because the Zigbee network backup is only a high-level and stack-agnostic backup of your device's network data (written in the Open Coordinator Backup Format) but it at least allows you to snapshot the device state and move your network between any hardware and firmware versions supported by zigpy-cli. This backup format is human-readable and fully documented so users have to option to manually fill out or change the appropriate information by hand to form a network if they are migrating from a Zigbee Coordinator that is not currently supported.

https://github.com/zigpy/open-coordinator-backup

[tube0013]

Backup and Restore added in 0.2.2