…ted properly (#468)

- sort imports using isort

closes #469 

```
@app.route('/custom_cors', cors=CORSConfig(allow_origin='localhost', allow_methods=["GET"], extra_headers={"X-TEST":"X-HEADER-VALUE"}))
def custom_cors():
    return jsonify('localhost is allowed with GET method')
```

```
    from goblet.alerts.alerts import BackendAlert, PubSubDLQAlert, UptimeAlert
    from goblet.alerts.alert_conditions import MetricCondition, CustomMetricCondition, LogMatchCondition, PubSubDLQCondition, UptimeCondition

        app = Goblet(function_name="alerts-test")

        metric_alert = BackendAlert(
            "metric",
            conditions=[
                MetricCondition(
                    "test",
                    metric="cloudfunctions.googleapis.com/function/execution_count",
                    value=10,
                )
            ],
        )
        log_alert = BackendAlert(
            "error",
            conditions=[LogMatchCondition("error", "severity>=ERROR")],
        )
        custom_alert = BackendAlert(
            "custom",
            conditions=[
                CustomMetricCondition(
                    "custom",
                    metric_filter="severity=(ERROR OR CRITICAL OR ALERT OR EMERGENCY) httpRequest.status=(500 OR 501 OR 502 OR 503 OR 504)",
                    value=10,
                )
            ],
        )

        app.alert(metric_alert)
        app.alert(log_alert)
        app.alert(custom_alert)

        @app.pubsub_subscription(
            "test",
            dlq=True,
            dlq_alerts=[
                PubSubDLQAlert(
                    "pubsubdlq",
                    conditions=[
                        PubSubDLQCondition(
                            "pubsubdlq",
                            subscription_id="pubsub-deploy-subscription",
                        )
                    ],
                )
            ],
        )
       def pubsub(data):
            return true

@app.uptime(timeout="30s",alerts=[UptimeAlert("uptime", conditions=[UptimeCondition("uptime")])])
def uptime_check():
    app.log.info("success")
    return "success"

```

* Add default alert type (#473 )
* Fix alert sync
* Fix duplicate deployment (#474 )

upload the code to GOBLET_UPLOAD_BUCKET tagged with first tag in
GOBLET_BUILD_TAGS
deploy cloudfunctionv1 from GOBLET_UPLOAD_BUCKET + GOBLET_ARTIFACT_TAG
(closes #447 )