chore: build out the infrastructure for commands to be passed to the clap CLI

cli-clap/src/lib.rs

@@ -1,4 +1,15 @@
-pub fn main() {
+use clap::{Parser, Subcommand};
+
+#[derive(Debug, Subcommand)]
+enum Command {}
+
+#[derive(Debug, Parser)]
+pub struct Args {
+    #[command(subcommand)]
+    command: Command,
+}
+
+pub fn main(args: Args) {
     #[cfg(feature = "tracing")]
     tracing::info!("What's up, world?");
 }