Merge branch 'raimo/net/implement-read_ahead/GH-8561/OTP-19199' into …

…maint

* raimo/net/implement-read_ahead/GH-8561/OTP-19199:
  Test read_ahead true|false performance
  Document option `read_ahead`
  Test read_ahead = false
  Don't try to recv peek the header
  Try to recv peek the header - failed (Linux bug?)
  Honour `{read_ahead,true}` and make it default again
  Implement read_ahead option for gen_tcp_socket
  Re-implement gen_tcp_socket to not read ahead