Create new data download function to download raw data from S3

[Thiyaghessan]

• Scans AWS S3 for newest file paths
• Downloads to a folder of user's choosing if it does not already exist

[lecy]

This function exists in the irs990efile package. The batch index is the most recent files posted to S3:

https://github.com/Nonprofit-Open-Data-Collective/irs990efile/blob/main/R/GET_AWS_INDEX.R

[lecy]

👆borrow and adapt if helpful!