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/bin/node/cli/src/command.rs

@@ -94,7 +94,7 @@ pub fn run() -> Result<()> {
 				You can enable it with `--features runtime-benchmarks`.".into())
 			}
 		}
-		Some(Subcommand::Key(cmd)) => cmd.run(),
+		Some(Subcommand::Key(cmd)) => cmd.run(&cli),
 		Some(Subcommand::Sign(cmd)) => cmd.run(),
 		Some(Subcommand::Verify(cmd)) => cmd.run(),
 		Some(Subcommand::Vanity(cmd)) => cmd.run(),