Add arcade --version (#211)

# PR Description
Implements a version callback for the arcade CLI.

### Usage
`arcade --version` OR `arcade -v`

### Example Output
`Arcade (version 0.1.5)`

arcade/arcade/cli/main.py

@@ -36,6 +36,7 @@ from arcade.cli.utils import (
     load_eval_suites,
     log_engine_health,
     validate_and_get_config,
+    version_callback,
 )
 
 cli = typer.Typer(
@@ -475,3 +476,17 @@ def workerup(
         error_message = f"❌ Failed to start Arcade Worker: {escape(str(e))}"
         console.print(error_message, style="bold red")
         typer.Exit(code=1)
+
+
+@cli.callback()
+def version(
+    _: bool = typer.Option(
+        None,
+        "-v",
+        "--version",
+        callback=version_callback,
+        is_eager=True,
+        help="Print version and exit.",
+    ),
+) -> None:
+    pass

arcade/arcade/cli/utils.py

@@ -667,3 +667,13 @@ def parse_user_command(user_input: str) -> ChatCommand | None:
         return ChatCommand(user_input)
     except ValueError:
         return None
+
+
+def version_callback(value: bool) -> None:
+    """Callback implementation for the `arcade --version`.
+    Prints the version of Arcade and exit.
+    """
+    if value:
+        version = importlib.import_module("arcade").__version__
+        console.print(f"[bold]Arcade[/bold] (version {version})")
+        exit()