add --no-color option to disable colors in the terminal (#518)

add --no-color option to disable colors

this commit adds a new option to disable colors in the terminal and also
moves the logger configuration to a different crate.

Signed-off-by: Sebastian Webber <sebastian@swebber.me>

src/cmd_args.rs

@@ -13,6 +13,15 @@ pub struct Args {
 
     #[clap(short='F', long, value_enum, default_value_t=LogFormat::Text, env)]
     pub log_format: LogFormat,
+
+    #[arg(
+        short,
+        long,
+        default_value_t = false,
+        env,
+        help = "disable colors in the log output"
+    )]
+    pub no_color: bool,
 }
 
 pub fn parse() -> Args {