Batch Requests composed using Kiota request builders

[nikithauc]

AB#10684

[nikithauc]

Feedback to consider during design changes - #822 (comment)

[baywet]

@ddyett it seems the AB bot is still configured here, not sure whether this is intended.

[sebastienlevert]

Actually... SDK developers should not know that they need to encode. It's not their responsibility. I tend to think we should do the heavy lifting and offer a consistent experience.