add --no-color option to disable colors in the terminal

[sebastianwebber]

added another option to disable colors - if needed:

❯ cargo run -- --help                                                          
    Finished dev [unoptimized + debuginfo] target(s) in 0.21s
     Running `target/debug/pgcat --help`
PgCat: Nextgen PostgreSQL Pooler

Usage: pgcat [OPTIONS] [CONFIG_FILE]

Arguments:
  [CONFIG_FILE]  [env: CONFIG_FILE=] [default: pgcat.toml]

Options:
  -l, --log-level <LOG_LEVEL>    [env: LOG_LEVEL=] [default: INFO]
  -F, --log-format <LOG_FORMAT>  [env: LOG_FORMAT=] [default: text] [possible values: text, structured, debug]
  -n, --no-color                 disable colors in the log output [env: NO_COLOR=]
  -h, --help                     Print help
  -V, --version                  Print version

Also moved the tracing stuff to a separate crate.

[levkk]

Absolutely!