refactor(zfctl): improve logs

[J-Loudet]

This commit brings some improvements to the outputted logs when launching zfctl and the zfctl daemon command.

The most notable additions are:

• when starting a Zenoh-Flow Daemon, its name and Zenoh ID will be logged,
• the RUST_LOG environment variable will be used if specified,
• the default logging level was set to zfctl=info,zenoh_flow=info.

• zfctl/src/daemon_command.rs:
  • Added a span at the top of the run method to be used within the async block.
  • Reworked the code to not panic! when an error occurred but instead return it and/or add logs.
• zfctl/src/instance_command.rs:
  • Properly display the id of the newly created instance.
  • Display a command to check for the status of a newly created instance.
• zfctl/src/main.rs:
  • Read the environment variable RUST_LOG to control the logs.
  • Set the default logging to zfctl=info,zenoh_flow=info.
  • Instrument the async block using a span.
• zfctl/src/run_local_command.rs:
  • Reworked the code to not panic when an error occurred but instead return it and/or add logs.
• zfctl/src/utils.rs:
  • Reworked the code to not panic when an error occurred but instead return it and/or add logs.