Update design for task classes like LargeFileTaskUpload and PageIterator task.

[nikithauc]

Currently, when creating the LargeFileUpload object or the PageIterator object, we are passing a Client object which is used to make the requests. The current design creates limitations in customizing the GraphRequest object options. Example - To pass custom headers in the PageIterator, we pass a requestOptions parameter while creating the PageIterator object. Another problem I came across was when working on #359. The response format of Outlook and OneDrive are different and I need to customize the ResponseType in the GraphRequest object.

Related to - https://github.com/microsoftgraph/msgraph-sdk-design/issues/37

The design of the task classes should be updated to allow easy customizations and changeability. The relations between the classes can be reengineered. Example - use a behavioral design pattern.

AB#7642

[nikithauc]

To be considered with #500 and #499

[ddyett]

tracked now in sdk design