feat(cli): add buzz command

`jj buzz` is an easter egg command that sends a bell character to the
terminal. Running `jj buzz` is expected to make a bell sign

cli/src/commands/buzz.rs

@@ -0,0 +1,35 @@
+// Copyright 2024 The Jujutsu Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+use std::io::Write;
+
+use tracing::instrument;
+
+use crate::cli_util::CommandHelper;
+use crate::command_error::CommandError;
+use crate::ui::Ui;
+
+/// Display version information
+#[derive(clap::Args, Clone, Debug)]
+pub(crate) struct BuzzArgs {}
+
+#[instrument(skip_all)]
+pub(crate) fn cmd_buzz(
+    ui: &mut Ui,
+    _command: &CommandHelper,
+    _args: &BuzzArgs,
+) -> Result<(), CommandError> {
+    write!(ui.stdout(), "\x07")?; // https://www.ascii-code.com/7
+    Ok(())
+}

cli/src/commands/mod.rs

@@ -18,6 +18,7 @@ mod backout;
 #[cfg(feature = "bench")]
 mod bench;
 mod bookmark;
+mod buzz;
 mod commit;
 mod config;
 mod debug;
@@ -87,6 +88,7 @@ enum Command {
     // TODO: Remove in jj 0.28+
     #[command(subcommand, hide = true)]
     Branch(bookmark::BookmarkCommand),
+    Buzz(buzz::BuzzArgs),
     #[command(alias = "print", hide = true)]
     Cat(file::show::FileShowArgs),
     // TODO: Delete `chmod` in jj 0.25+
@@ -185,6 +187,7 @@ pub fn run_command(ui: &mut Ui, command_helper: &CommandHelper) -> Result<(), Co
             let cmd = renamed_cmd("branch", "bookmark", bookmark::cmd_bookmark);
             cmd(ui, command_helper, args)
         }
+        Command::Buzz(args) => buzz::cmd_buzz(ui, command_helper, args),
         Command::Cat(args) => {
             let cmd = renamed_cmd("cat", "file show", file::show::cmd_file_show);
             cmd(ui, command_helper, args)