fix: high throughput streams

[jacobheun]

While testing ipfs/interop I encountered an issue with high throughput streams (file transfers). This adds a benchmark to test a large file transfer. Currently it tests a 128MB file. The performance issue was due to an improper checking of the logger being enabled. toString was being called unnecessarily, which caused a large block in IO. Details of the performance differences are below.

New Benchmark: Large file

# Before the fix
$ node large-file.js --lib=pull-mplex --repeat=1 --runs=3
sendFile*1: 6589.224ms
sendFile*1: 6592.975ms
sendFile*1: 6575.001ms

# After the fix
$ node large-file.js --lib=pull-mplex --repeat=1 --runs=3
sendFile*1: 365.876ms
sendFile*1: 299.767ms
sendFile*1: 321.524ms

pull-mplex vs libp2p-mplex

# pull-mplex
$ node large-file.js --lib=pull-mplex --repeat=1 --runs=3
sendFile*1: 403.556ms
sendFile*1: 346.207ms
sendFile*1: 306.421ms

# libp2p-mplex
$ node large-file.js --lib=libp2p-mplex --repeat=1 --runs=3
sendFile*1: 519.056ms
sendFile*1: 481.365ms
sendFile*1: 465.422ms

[vasco-santos]

Wow, what an edge case!

Awesome improvements 🚀