Fetch does not support webstreams #946
Description
Currently, fetch only support reading entire responses and requests from and into memory.
The streaming API's of Request and Response is not implemented.
Since the introduction of native streaming API's by @jackkleeman this functionality is now possible.
Spec is here:
https://fetch.spec.whatwg.org/#body
body should return a ReadableStream.
Currently we return null:
llrt/modules/llrt_http/src/response.rs
Line 316 in 38af490