New port: net/librespeed-go: Go backend for LibreSpeed

LibreSpeed-go is a very lightweight speed test.
Is is implemented in JavaScript, using XMLHttpRequest and Web Workers.
This port uses GO as backend for hosting. And this in comparison to
www/librespeed where PHP and a web server are required.

WWW: https://github.com/librespeed/speedtest-go

PR: 247202
Submitted by: Dries Michiels <driesm.michiels@gmail.com>