Fix base-path handling in key insert (#7775)

This fixes the handling of base-path when using `key insert`. Before
the base-path wasn't setup correctly, as done when starting a node. This
resulted in putting the keys into the wrong directory. This pr fixes
this by creating the correct base-path/config dir for the keystore.
Besides that it also removes the insert command from `subkey` as it
doesn't make that much sense. If requested, we could bring it back later.

substrate/client/keystore/src/local.rs

@@ -167,9 +167,7 @@ impl SyncCryptoStore for LocalKeystore {
 		let all_keys = SyncCryptoStore::keys(self, id)?
 			.into_iter()
 			.collect::<HashSet<_>>();
-		Ok(keys.into_iter()
-		   .filter(|key| all_keys.contains(key))
-		   .collect::<Vec<_>>())
+		Ok(keys.into_iter().filter(|key| all_keys.contains(key)).collect::<Vec<_>>())
 	}
 
 	fn sign_with(