[dirigera] Add matter plugs

[weymann]

Add support for Matter plugs GRILLPLATS and TOFSMYGGA.

Fixes #20436

[Copilot]

Pull request overview

Adds Dirigera Matter support for IKEA smart plugs (e.g., GRILLPLATS / TOFSMYGGA) by introducing a new Matter outlet thing type, mapping outlet + electrical-sensor relations, and extending the Matter model to support additional state/command conversions.

Changes:

• Add a new matter-outlet thing type and discovery/identification mapping for Matter outlet + electricalSensor devices.
• Extend Matter device configuration (devices.json) to expose power/startup and electrical measurement channels for these devices.
• Add tests and test fixtures for GRILLPLATS and update existing test expectations accordingly.

Reviewed changes

Copilot reviewed 13 out of 13 changed files in this pull request and generated 10 comments.

Show a summary per file

File	Description
bundles/org.openhab.binding.dirigera/src/main/java/org/openhab/binding/dirigera/internal/model/MatterModel.java	Adds DateTime state conversion, format transformation for commands, numeric command parsing, and extra logging for unknown device types.
bundles/org.openhab.binding.dirigera/src/main/java/org/openhab/binding/dirigera/internal/model/DirigeraModel.java	Identifies Matter outlet/electricalSensor devices as THING_TYPE_MATTER_OUTLET.
bundles/org.openhab.binding.dirigera/src/main/java/org/openhab/binding/dirigera/internal/handler/matter/MatterOutlet.java	New handler class for Matter outlet things (currently a thin BaseMatterHandler wrapper).
bundles/org.openhab.binding.dirigera/src/main/java/org/openhab/binding/dirigera/internal/DirigeraHandlerFactory.java	Wires the new THING_TYPE_MATTER_OUTLET to the new MatterOutlet handler.
bundles/org.openhab.binding.dirigera/src/main/java/org/openhab/binding/dirigera/internal/Constants.java	Adds THING_TYPE_MATTER_OUTLET and includes it in supported types.
bundles/org.openhab.binding.dirigera/src/main/resources/json/matter/devices.json	Adds device model entries for outlet and electricalSensor including channel mappings.
bundles/org.openhab.binding.dirigera/src/main/resources/OH-INF/thing/matter.xml	Declares the new matter-outlet thing-type.
bundles/org.openhab.binding.dirigera/src/main/resources/OH-INF/i18n/dirigera.properties	Adds i18n label/description keys for matter-outlet.
bundles/org.openhab.binding.dirigera/README.md	Documents the new Matter plug thing type.
bundles/org.openhab.binding.dirigera/src/test/java/org/openhab/binding/dirigera/internal/model/TestModel.java	Updates expected device/discovery counts for the new fixtures.
bundles/org.openhab.binding.dirigera/src/test/java/org/openhab/binding/dirigera/internal/handler/matter/TestMatterOutlet.java	Adds handler creation/initialization/command tests for Matter outlets.
bundles/org.openhab.binding.dirigera/src/test/resources/home/matter-home.json	Adds GRILLPLATS outlet + electrical sensor devices to the simulated home model.
bundles/org.openhab.binding.dirigera/src/test/resources/devices/grillplats.json	Adds a dedicated GRILLPLATS device fixture.

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