RDKEMW-17486 : Add dolbyAtmosExperienceAvailable getter and event sub…

[swethasukumarr]

…scription

[Copilot]

Pull request overview

Adds a new Device API surface for querying and subscribing to Dolby Atmos experience availability, and wires it through implementation and OpenRPC fixtures so unit/component tests and the demo app can exercise it.

Changes:

• Added Device.dolbyAtmosExperienceAvailable getter to the public IDevice interface and DeviceImpl.
• Added Device.onDolbyAtmosExperienceAvailableChanged subscription API to IDevice/DeviceImpl plus unit/component coverage.
• Updated OpenRPC spec fixtures (current + legacy + app notifier) and the API demo app to include the new method.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
include/firebolt/device.h	Extends the public IDevice interface with the new getter and subscription API.
src/device_impl.h	Declares the new DeviceImpl overrides for the added IDevice methods.
src/device_impl.cpp	Implements the getter via helper_.get<Boolean> and the event subscription via subscriptionManager_.
test/unit/deviceTest.cpp	Adds unit tests for success/bad-response paths for the getter and a subscription smoke test.
test/component/deviceTest.cpp	Adds component tests for the getter and end-to-end event subscription + event trigger flow.
test/api_test_app/apis/deviceDemo.cpp	Exposes the new getter in the demo app’s method list and output.
docs/openrpc/the-spec/firebolt-open-rpc.json	Adds the new getter method and event subscription definition with examples/tags.
docs/openrpc/the-spec/firebolt-open-rpc--legacy.json	Mirrors the getter + subscriber definitions in the legacy OpenRPC fixture.
docs/openrpc/the-spec/firebolt-app-open-rpc.json	Adds the app-side notifier definition for the new Device event.