Build out lambda function to fetch the ROR snapshot

[briri]

See the explorer_ror lambda function in the dmptool branch. This was an initial attempt to fetch the zip and process it within a Lambda. We hit a wall though when extracting the contents of the ZIP file. I suspect that it may just be an issue with the defined size of the Lambda environment.

Determine the sustainability of using Lambda for this since the size of the ROR database will continue to grow.

[briri]

This is done and working in dev now