add device list command

[Iris20050110]

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[Copilot]

Pull request overview

This PR introduces an IoT Hub “device list” command in the Azure.Mcp.Tools.IoTHub toolset, along with a result model, options type, and a unit test suite intended to validate max-count and truncation behaviors.

Changes:

• Added IoTHubDeviceListCommand to list device identities with an optional --max-count cap.
• Added DeviceListResult response model and IoTHubDeviceListOptions options type.
• Added unit tests for basic success, max-count capping, truncation messaging, and invalid max-count handling.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 7 comments.

File	Description
tools/Azure.Mcp.Tools.IoTHub/src/Commands/Device/IoTHubDeviceListCommand.cs	New command implementation for listing IoT Hub devices (currently references multiple missing/incorrect types/namespaces).
tools/Azure.Mcp.Tools.IoTHub/src/Options/Device/IoTHubDeviceListOptions.cs	New options type for the device list command (currently doesn’t align with repo option patterns / missing required fields).
tools/Azure.Mcp.Tools.IoTHub/src/Models/DeviceListResult.cs	New response model for listing devices (depends on missing DeviceIdentity model).
tools/Azure.Mcp.Tools.IoTHub/tests/Azure.Mcp.Tools.IoTHub.UnitTests/Device/IoTHubDeviceListCommandTests.cs	Unit tests for the new command (currently depends on missing/incorrect namespaces and missing IoT Hub toolset types).