Add Interlock Mode

[gui9394]

Description

This PR introduces an Interlock Mode (mutually exclusive switch mode) for multi-channel switches (devices with 2 or more relay channels).

When active, it ensures only one relay channel is active at a time. If another channel is commanded to turn on, the previously active channel is turned off first, followed by a configurable delay (in milliseconds) before the requested channel is activated.

Key Changes

1. Firmware Logic (src/zigbee/relay_cluster.c, relay_cluster.h)

• Implemented basic interlock checks inside relay_cluster_on.
• Added asynchronous task scheduling via hal_tasks_schedule to implement the delay without blocking the CPU.
• Added a pending_on state tracking variable to handle race conditions under rapid sequential toggling, canceling pending relay activations when a different channel is selected.
• Forced immediate OFF reports (hal_zigbee_send_report_attr) when a pending channel activation is canceled, keeping the controller's UI in sync with the hardware.
• Deferred ZCL report_handler execution outside of ZCL message processing callbacks to prevent report packet drops inside command handlers.

2. Zigbee Custom Attributes (src/zigbee/consts.h, basic_cluster.c, basic_cluster.h)

• Added 0xFF03 (ZCL_ATTR_BASIC_INTERLOCK_MODE) - Boolean.
• Added 0xFF04 (ZCL_ATTR_BASIC_INTERLOCK_DELAY) - Uint16 (in milliseconds).
• Enabled NVM persistence.

3. Integrations & Generators

• Zigbee2MQTT: Updated converter templates (switch_custom.js.jinja) to automatically expose interlockMode and interlockDelay on devices with 2+ relays.
• ZHA: Added ZHA quirk mapping support in zha_quirk.py.jinja.
• HOMEd: Extended make_homed_extension.py.

[falkenhawk]

@gui9394 thank you. I am soo looking forward to see this included in the main build. @andrei-lazarov 🙏 I need it in order not to kill my kichen hood turbine, which never must be supplied with live over more that 1 speed at a time.

May I test the build somehow on a 4ch Avatto ZWSM16-4-ZIGBEE? I guess the definitions need to be adjusted to cover that module?