Expose TransportApiResponse

[pquentin]

The documented way to call perform_request on a node is to expect a tuple in response, Tuple[ApiResponseMeta, bytes]. But the actual underlying type is TransportApiResponse:

class TransportApiResponse(NamedTuple):
    meta: ApiResponseMeta
    body: Any

As pointed out by @ywangd, It would make sense to expose it alongside other responses types and change the Nodes docs page to use it.

[JessicaGarson]

Opened a PR here. I have some linting issues it seems. Should I be using Black for formatting?

[JessicaGarson]

I figured out the formatting issues!