Serialization of accessRequest.content property

[zengin]

Current implementation does not reflect the following spec:

          > Should we rename [accessRequest.content](https://github.com/microsoft/OpenApi.ApiManifest/blob/96b16a2c710e44765d12ae39c50b2b7b2410e4e0/src/lib/AccessRequest.cs#L13) to accessRequest.actions to match RAR's authorization_details?

No. Content represents the entire object. Actions is only a potential suggestion of a property name within the RAR. The content of the RAR can be anything. The only required field is type. I see now that the object model that I created makes the assumption that there will be a property called content, but that isn't in the spec. I think what we should do is have the content property in C# contain the entire object in Authorization Details array, and we should just pull the Type property out from within the parsed Content object. We will be holding the Type redundantly but I think that is ok.

Originally posted by @darrelmiller in #7 (comment)