Add SONOFF TP-WGZBA Zigbee thermostat support

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Type of Change

• WWST Certification Request
  • If this is your first time contributing code:
    • I have reviewed the README.md file
    • I have reviewed the CODE_OF_CONDUCT.md file
    • I have signed the CLA
  • I plan on entering a WWST Certification Request or have entered a request through the WWST Certification console at developer.smartthings.com
• Bug fix
• New feature
• Refactor

Checklist

• I have performed a self-review of my code
• I have commented my code in hard-to-understand areas
• I have verified my changes by testing with a device or have communicated a plan for testing
• I am adding new behavior, such as adding a sub-driver, and have added and run new unit tests to cover the new behavior

Description of Change

Add SONOFF TP-WGZBA support to the zigbee-thermostat driver.

• Manufacturer: SONOFF
• Model: TP-WGZBA
• Protocol: Zigbee
• Driver: zigbee-thermostat (new sonoff / sonoff.tp_wgzba sub-drivers)

Implementation

1. Fingerprint SONOFF/TP-WGZBA → profile thermostat-sonoff
2. Standard Thermostat cluster for mode, heating setpoint, operating state, and local temperature calibration
3. Manufacturer-specific cluster 0xFC11 (mfg 0x1286) for child lock, open-window, temporary/override mode, radar, screen, relay polarity, NTC, and overheat protection
4. Integration tests aligned with current sonoff/tp_wgzba/init.lua behavior

Summary of Completed Tests

• test_sonoff_tp_wgzba_thermostat.lua: 25/25 passed (local Lua 5.3 + capability definitions)
• Covered: lifecycle (init/added/driverSwitched/doConfigure), refresh, standard thermostat reports/commands, private attribute reports/writes, temporary mode commands, threshold/time-period/relay capability writes

[CLAassistant]

All committers have signed the CLA.