feat: CLI stdout logs are clean and readable

[vansangpfiev]

We are using trantor logger for cli output, it has other metadata information.

> .\cortex-cpp.exe models start tinyllama
20240828 04:13:34.427000 UTC 8240 INFO  {"message":"Model loaded successfully"} - start_model_cmd.cc:35

Should only output something like

Model tinyllama loaded successfully

[freelerobot]

I think there are 2 logging modes:

• verbose: raw log dump
• default: nice stdout logging as you indicated

Is it possible to let users toggle btw the two. They also don't have to be mutually exclusive, i.e. verbose is a superset of both.

[vansangpfiev]

I think there are 2 logging modes:

• verbose: raw log dump
• default: nice stdout logging as you indicated

Is it possible to let users toggle btw the two. They also don't have to be mutually exclusive, i.e. verbose is a superset of both.

We added the --verbose flag for each CLI command. I'm not sure which use-case user needs to toggle between the two. Can you please elaborate more on that?