✨ feat(label_cli): implement remove label subcommand

- add `remove` subcommand to the label CLI
- allow users to remove a label from a specific rule by ID

src/config_cli/label_cli/remove_cli.rs

@@ -0,0 +1,19 @@
+use clap::Parser;
+
+use cull_gmail::{Config, Result};
+
+#[derive(Debug, Parser)]
+pub struct RemoveCli {
+    /// Id of the rule on which action applies
+    #[clap(short, long)]
+    id: usize,
+    /// Label to remove from the rule
+    #[clap(short, long)]
+    label: String,
+}
+
+impl RemoveCli {
+    pub fn run(&self, _config: Config) -> Result<()> {
+        Ok(())
+    }
+}