Add default converters for BinaryData

[mathewc]

We should add default converters for byte[] <=> BinaryData to the core set of converters here. This will enable the type for all extensions. Usability studies show that BinaryData makes may common binary conversion operations easier, and the Type will start showing up more and more places throughout the Azure SDK for .NET.

The type is defined in the OOB System.Memory.Data nuget package.