listen for logs from the on-device log_listener
usage: fx log [-h | --help] [--raw] [-r | --remote-symbols] LOG_LISTENER_FLAGS
--raw do not attempt to symbolize the log
--help|-h show this help and attempt to also show the
on-device log_listener help
LOG_LISTENER_FLAGS flags (e.g., severity) to pass to the on-device
log_listener; supported flags are listed at
https://fuchsia.dev/fuchsia-src/reference/diagnostics/consumers/log_listener.
Creates an SSH connection with a device and starts listening for logs.
It will listen to the device specified with `fx -d DEVICE log` or
`fx set-device`, otherwise it will try to find a connected device.
If the command hangs without printing anything, first check to make sure `fx shell`
works on its own.
For more information on flags supported by the on-device log_listener, see
https://fuchsia.dev/fuchsia-src/reference/diagnostics/consumers/log_listener.