[R] Implement full S3FileSystem/S3Options constructor #17326
Description
Currently you can access data in S3 by URI, which can include auth and other query parameters (ARROW-9854), but you can't directly construct an S3Options object.
Reporter: Neal Richardson / @nealrichardson
Assignee: Neal Richardson / @nealrichardson
PRs and other links:
Note: This issue was originally created as ARROW-9869. Please see the migration documentation for further details.