[Feature request?] Add Support Transfer-Encoding chunked in Request

I'm adding the framework to a new benchmark, and fail the tests because test send chunked body.

It'll be useful for some IoT, and other APIs than use it.

We can check the PR to add Workerman to the bench in: https://github.com/MDA2AV/HttpArena/pull/169

Also you will read a nice AI bot :)

Thank you Walkor.

PD: a new bench will give us more information to improve the code.