Add a utility script that re-triggers hubverse-transform-model-output_lambda

[bsweger]

Resolves #27

First iteration of a way to re-trigger the lambda function that fires when new data is added to the raw/model-output/ folder of a hub's S3 bucket.

To try this as part of code review:

1. Make sure you have write access to S3 buckets in the Hubverse AWS account
2. Pull this branch and python faas/lambda_retrigger_model_output_add.py bsweger-flusight-forecast

---

I ran this against the bsweger-flusight-forecast test hub and confirmed that:

• a new/updated x-amz-meta-manual-update metadata field was added to all files in bsweger-flusight-forecast/raw/model-output:

  ➜ aws s3api head-object --bucket bsweger-flusight-forecast --key raw/model-output/UMass-flusion/2023-10-14-UMass-flusion.csv --no-sign-request
  {
  "AcceptRanges": "bytes",
  "LastModified": "Tue, 20 Aug 2024 17:39:00 GMT",
  "ContentLength": 357048,
  "ETag": "\"af50008c99f29b39310b57be5f474d28\"",
  "ContentType": "binary/octet-stream",
  "ServerSideEncryption": "AES256",
  "Metadata": {
      "x-amz-meta-manual-update": "2024-08-20 17:33:00.144132"
  }
  }

• the metadata updates invoked the "new model-output file" lambda, which re-processed all 1128 files and wrote updated output to bsweger-flusight-forecast/model-output

➜ python faas/lambda_retrigger_model_output_add.py bsweger-flusight-forecast
Updating metadata for all files in bsweger-flusight-forecast/raw/model-output/

Processing raw/model-output/CADPH-FluCAT_Ensemble/2023-10-14-CADPH-FluCAT_Ensemble.csv
Processing raw/model-output/CADPH-FluCAT_Ensemble/2023-10-21-CADPH-FluCAT_Ensemble.csv
Processing raw/model-output/CADPH-FluCAT_Ensemble/2023-10-28-CADPH-FluCAT_Ensemble.csv
[snip]
Updated metadata for 1129 files in bsweger-flusight-forecast/raw/model-output/