[R] Friendly interface for filesystems (S3)

[asfimport]

The Filesystem methods don't provide a human-friendly interface for basic operations like ls, mkdir, etc. Since we provide access to S3 and potentially other cloud storage, it would be nice to have simple methods for exploring it.

Additional ideas:

• S3Bucket class/constructor: it's basically a SubTreeFileSystem containing S3FS and a path, except that we can auto-detect a bucket's region.
• Add a class like the FileLocator C++ struct list(fs, path). also kinda like a SubTreeFileSystem, but with different methods and intents. Aside from use in ls/mkdir/cp, it could be used in file reader/writers instead of having an extra filesystem argument added everywhere, e.g. fs$path("path/to/file"). See ARROW-9869: [R] Implement full S3FileSystem/S3Options constructor #8197 (comment)

Reporter: Neal Richardson / @nealrichardson
Assignee: Neal Richardson / @nealrichardson

PRs and other links:

• GitHub Pull Request #8351

_{Note: This issue was originally created as ARROW-9870. Please see the migration documentation for further details.}

[asfimport]

Neal Richardson / @nealrichardson:
Issue resolved by pull request 8351
#8351