[MCC-115094] Added HypermediaQueryExtensions

Added extension methods for IHypermediaQuery. Now you can go:

```csharp
var query = client.CreateQuery().WithRepresentor(representor).Follow("my-rel").FollowWithData("sausages", sausage);
await client.ExecuteQueryAsync(query);
```

@kenyamat @mdsol/hypermedia-team Please review and merge.