Pass HttpCompletionOption.ResponseHeadersRead to HttpClient for Stream responses

[andrueastman]

Related to microsoftgraph/msgraph-sdk-dotnet#1954

For calls to SendPrimitiveAsync<Stream> we should pass the HttpCompletionOption.ResponseHeadersRead to the HttpClient to avoid the loading of the entire stream buffer into memory as the requested stream may be unnecessarily large.
This could be done by passing the optional parameter once the return type is determined to be that of a Stream.
https://github.com/microsoft/kiota-http-dotnet/blob/main/src/HttpClientRequestAdapter.cs#L410

We can avoid this for other scenarios as typed return are not expected to run into this issue as the size is not expected to grow as much compared to an unknown Stream size.