Implement some basic benchmarks
Your goal will be to create a benchmark testing asyncdispatch2 against the Nim's existing asyncdispatch module and the best competing frameworks available in other programming languages. A suitable choice would be implementing one of the TechEmperor famous benchmarks:

https://www.techempower.com/benchmarks/#section=data-r15&hw=ph&test=plaintext

In particular, the plaintext case was selected because it makes use of HTTP pipelining which pushes all the frameworks to their limit. 

The expected delivery is working code for the test case with the new and the old asyncdispatch modules as well a set of helper scripts allowing us to re-run the tests later and compare the results against some of the best performing frameworks available for other languages.
