refactor(cli): simplify metadata command parameters (#6364)

Signed-off-by: WenyXu <wenymedia@gmail.com>

src/cli/src/metadata/control/del/key.rs

@@ -27,7 +27,6 @@ use crate::Tool;
 #[derive(Debug, Default, Parser)]
 pub struct DelKeyCommand {
     /// The key to delete from the metadata store.
-    #[clap(long)]
     key: String,
 
     /// Delete key-value pairs with the given prefix.

src/cli/src/metadata/control/get.rs

@@ -51,7 +51,7 @@ impl GetCommand {
 /// Get key-value pairs from the metadata store.
 #[derive(Debug, Default, Parser)]
 pub struct GetKeyCommand {
-    /// The key to get from the metadata store. If empty, returns all key-value pairs.
+    /// The key to get from the metadata store.
     #[clap(default_value = "")]
     key: String,