fix(@libp2p/protocol-perf): use noise for encryption

[maschad]

Closes #1991

[achingbrain]

@mxinden's comment in #1991 was:

For a better comparison, consider using TLS or Noise in the js-libp2p perf implementation as well.

This is "instead of" rather than "as well", is that correct?

There doesn't seem to be an option to select the encryption method so this is probably what was intended?

[mxinden]

Correct. Noise instead of plaintext. Opposite to the interop tests, the perf benchmarks can not (yet) select a security protocol.