Zigbee flasher for Sonoff ZB Bridge Pro - dump + firmware

[s-hadinger]

Description:

Added:

• ability to dump original firmware
• added firmware to local repository

Checklist:

• The pull request is done against the latest development branch
• Only relevant files were touched
• Only one feature/fix was added per PR and the code change compiles without warnings
• The code change is tested and works with Tasmota core ESP8266 V.2.7.4.9
• The code change is tested and works with Tasmota core ESP32 V.2.0.3
• I accept the CLA.

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