test(taskbroker): Add CLI command for sending taskbroker tasks (#81319)

### Overview
This PR is responsible for adding a CLI tool for sending tasks to the
taskbroker to assist with iterative local development.


Refs: #81240

### Testing
```
sentry run taskbroker-send-tasks --task-function-path sentry.taskworker.tasks.example.say_hello --args '["foobar"]' --repeat 2
```

Author: enochtangg

src/sentry/runner/commands/run.py

@@ -253,6 +253,53 @@ def taskworker(rpc_host: str, max_task_count: int, **options: Any) -> None:
         raise SystemExit(exitcode)
 
 
+@run.command()
+@log_options()
+@configuration
+@click.option(
+    "--repeat",
+    type=int,
+    help="Number of messages to send to the kafka topic",
+    default=1,
+    show_default=True,
+)
+@click.option(
+    "--kwargs",
+    type=str,
+    help="Task function keyword arguments",
+)
+@click.option(
+    "--args",
+    type=str,
+    help="Task function arguments",
+)
+@click.option(
+    "--task-function-path",
+    type=str,
+    help="The path to the function name of the task to execute",
+    required=True,
+)
+def taskbroker_send_tasks(
+    task_function_path: str,
+    args: str,
+    kwargs: str,
+    repeat: int,
+) -> None:
+    from sentry.utils.imports import import_string
+
+    try:
+        func = import_string(task_function_path)
+    except Exception as e:
+        click.echo(f"Error: {e}")
+        raise click.Abort()
+    task_args = [] if not args else eval(args)
+    task_kwargs = {} if not kwargs else eval(kwargs)
+
+    for _ in range(repeat):
+        func.delay(*task_args, **task_kwargs)
+    click.echo(message=f"Successfully sent {repeat} messages.")
+
+
 @run.command()
 @click.option(
     "--pidfile",

src/sentry/taskworker/tasks/examples.py

@@ -0,0 +1,13 @@
+from __future__ import annotations
+
+import logging
+
+from sentry.taskworker.registry import taskregistry
+
+logger = logging.getLogger(__name__)
+exampletasks = taskregistry.create_namespace(name="examples")
+
+
+@exampletasks.register(name="examples.say_hello")
+def say_hello(name: str) -> None:
+    print(f"Hello {name}")  # noqa