Add streaming benchmark code here

[p-shahi]

This repo is to house the streaming benchmark gist for https://gist.github.com/achingbrain/7e65ca748326d3b87b81508020a3321d which was used to test libp2p/js-libp2p#1847
Creating it as it's own repo so that:

• It's not dangling as a gist
• Easier to discover and maintain