ENH: Add signed URL transformer

[dmoore247]

Is your feature request related to a problem? Please describe.
Need to make a cohort of images available to a specific consumer.

Describe the solution you'd like
Based on the cloud storage path, create a short lived signed URL for compatibility with other tools

Based on the cloud platform and integrated IAM role ... create a signed URL. Return the URL as a column in the output_col.
The Transformer parameters should include duration, default 3600 seconds.

Describe alternatives you've considered
Direct paths work find when running on an integrated VM but don't work well with off-cloud consumers.

Return a URL based on a Driver Proxy and DBTunnel is a possible alternative

Additional context