CLI for Tool Repository (#1357)

This commit adds two commands to the CLI:

- `crewai tool publish`
    - Builds the project using Poetry
    - Uploads the tarball to CrewAI's tool repository

- `crewai tool install my-tool`
    - Adds my-tool's index to Poetry and its credentials
    - Installs my-tool from the custom index

src/crewai/cli/command.py

@@ -0,0 +1,40 @@
+from typing import Dict, Any
+from rich.console import Console
+from crewai.cli.plus_api import PlusAPI
+from crewai.cli.utils import get_auth_token
+from crewai.telemetry.telemetry import Telemetry
+
+console = Console()
+
+
+class BaseCommand:
+    def __init__(self):
+        self._telemetry = Telemetry()
+        self._telemetry.set_tracer()
+
+
+class PlusAPIMixin:
+    def __init__(self, telemetry):
+        try:
+            telemetry.set_tracer()
+            self.plus_api_client = PlusAPI(api_key=get_auth_token())
+        except Exception:
+            self._deploy_signup_error_span = telemetry.deploy_signup_error_span()
+            console.print(
+                "Please sign up/login to CrewAI+ before using the CLI.",
+                style="bold red",
+            )
+            console.print("Run 'crewai signup' to sign up/login.", style="bold green")
+            raise SystemExit
+
+    def _handle_plus_api_error(self, json_response: Dict[str, Any]) -> None:
+        """
+        Handle and display error messages from API responses.
+
+        Args:
+            json_response (Dict[str, Any]): The JSON response containing error information.
+        """
+        error = json_response.get("error", "Unknown error")
+        message = json_response.get("message", "No message provided")
+        console.print(f"Error: {error}", style="bold red")
+        console.print(f"Message: {message}", style="bold red")