Stress `Transfer-Encoding: chunked` implementations of frameworks

[Kaliumhexacyanoferrat]

Currently, baseline uses a chunked encoded body for some of the requests, in a form, where gcannon writes the whole request to the request buffer at once. This is fairly simple for frameworks to handle, so we cover only a small set of LOC of the framework parsers. As efficiently reading chunked encoded bodies can be tricky, we should further stress the frameworks in that regard, for example by using chunked encoding for upload in some of the requests.