fix(protocol/perf): consider using tls or noise instead of plaintext

[mxinden]

All other libp2p perf protocol implementations use some mechanism of encryption. For a better comparison, consider using TLS or Noise in the js-libp2p perf implementation as well.

js-libp2p/packages/protocol-perf/src/main.ts

Lines 59 to 61 in 8977862

	connectionEncryption: [
	plaintext()
	],

//CC @maschad

Related pull request adding js-libp2p to libp2p/test-plans/perf libp2p/test-plans#244.