feat: add connector decorator

[hallvictoria]

Example function app:

import azure.functions as func
import azurefunctions.extensions.connectors.office365 as o365
import json
import logging

app = func.FunctionApp()


@app.function_name(name="OnNewEmail")
@app.connector_trigger(arg_name="emails")
def on_new_email(emails: o365.EmailObject[]) -> None:
    """
    Receives Office 365 email trigger callbacks.
    """
    logging.info("OnNewEmail trigger received. Emails: %s", emails)

    for email in emails:
        logging.info(f"Subject: {email.subject}")
        logging.info(f"From: {email.from}")