Create upload_bytes_to_bucket Cloud Function for LSST

[hernandezc1]

This PR creates the necessary changes to store LSST alerts in Google Cloud Storage buckets using the upload_bytes_to_bucket Cloud Function.

Here is an overview of the changes made in this PR:

• Rename setup_broker/rubin directory to setup_broker/lsst
• Rename consumer/rubin directory to consumer/lsst
  • PS_TOPIC_DEFAULT for VM updated: "${survey}-alerts -> "${survey}-alerts_raw"
  • The testid is now appended to the consumer.group.id in the VM's configuration files to prevent new deployments from picking up existing offsets
• setup_broker.sh deploys all of the necessary GCP resources
• Create cloud_functions/lsst/ps_to_gcs directory
  • main.py deduplicates the "incoming" alert stream, stores the alert (.avsc) in a GCS bucket, and publishes the original alert bytes (schema not included) to the lsst-alerts Pub/Sub topic; the schema version of each alert is attached in the Pub/Sub message attributes. The BigQuery subscriptions in Use BigQuery subscriptions to store LSST alert data #243 can use the schema version as a filter to write the alert data to the appropriate BigQuery table

[hernandezc1]

Pre-defining the buckets and making a .get_bucket request for each instance rather than each alert is a temporary solution I discussed with @troyraen. For future schema implementations, this will need to be updated