SDK updates from master branch.

This release is bringing changes from the master release 2020-10-8.

Microsoft.Azure.Devices.Client 1.32.0-preview-001

• Updated reference to Microsoft.Azure.Devices.Shared nuget.

Bug Fixes:

• Fix issue with .NET Standard 5 preview throwing "Not Supported Exception" (#1592)
• Fix cross target framework dependency management (#1562)

Microsoft.Azure.Devices 1.28.0-preview-001

• Add a new client (DigitalTwinClient) to support operations against Digital Twin. Digital Twin APIs operate on high-level constructs in the Digital Twins Definition Language (DTDL) such as components, properties, and commands. The Digital Twin APIs make it easier for solution builders to create IoT Plug and Play solutions.
• Updated reference to Microsoft.Azure.Devices.Shared nuget.

Bug Fixes:

• Fix cross target framework dependency management (#1562)
• Fix issue where NullReference exceptions are missing full stack traces.

Microsoft.Azure.Devices.Shared 1.26.0-preview-001

• Bumping the version for the Shared package in order to conform to the new versioning guidelines agreed upon in the Managed SDK team.

Microsoft.Azure.Devices.Provisioning.Client 1.17.0-preview-001

• Add a PnpConvention helper class for formatting the DPS device registration payload, per plug and play convention.
• Updated reference to Microsoft.Azure.Devices.Shared nuget.

Microsoft.Azure.Devices.Provisioning.Transport.Amqp 1.14.0-preview-001

• Updated reference to Microsoft.Azure.Devices.Shared nuget.

Microsoft.Azure.Devices.Provisioning.Client.Transport.Http 1.13.0-preview-001

• Updated reference to Microsoft.Azure.Devices.Shared nuget.

Microsoft.Azure.Devices.Provisioning.Transport.Mqtt 1.14.0-preview-001

• Updated reference to Microsoft.Azure.Devices.Shared nuget.

Microsoft.Azure.Devices.Provisioning.Security.Tpm 1.13.0-preview-001

• Updated reference to Microsoft.Azure.Devices.Shared nuget.

Microsoft.Azure.Devices.Provisioning.Service 1.17.0-preview-001

• Updated reference to Microsoft.Azure.Devices.Shared nuget.