Add Batch to graph client

[shemogumbe]

Leads to this usage:

batch_content = BatchRequestContent(batch_request_content)


async def test_batch():
    batch_result = await client.batch.post(batch_request_content=batch_content)
    for response in batch_result.responses.values():
        print(response.status)
        print(response.body)
        print(response.headers)


asyncio.run(test_batch())

[baywet]

Thank you for making the changes!
@shemogumbe make sure you squash this one when merging it, with a proper conventional commit message so the release triggers properly

[andrueastman]

We'll also need a similar PR in the beta lib too https://github.com/microsoftgraph/msgraph-beta-sdk-python

[shemogumbe]

Thank you for making the changes! @shemogumbe make sure you squash this one when merging it, with a proper conventional commit message so the release triggers properly

Mered before seeing this, will do another branch to trigger the release