Add support for properties used in the context of Alexa Smart Properties (review PR#236)

[nachawat]

Hello,

In the context of Alexa Smart Properties (e.g Alexa for Hospitality or Alexa for Residential), the request payload sent to a skill contains additional properties.

To ensure those properties are correctly deserialized, can you please review the PR https://github.com/timheuer/alexa-skills-dotnet/pull/236 ?

Objective is to provide support to the following properties into a new minor version of the Alexa.NET SDK for developers building skills in the context of Alexa Smart Properties using Alexa.NET SDK:

• context.System.device.persistentEndpointId
• context.System.unit.unitId
• context.System.unit.persistentUnitId

You can refer to the official Request and Response JSON Reference Alexa documentation for details about each above mentioned property.

Thank you Benoit

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[timheuer]

Fixed in mentioned PR