[copy_from] AWS source

[ParkMyCar]

Stacked on top of: #30956

This PR implements a new AwsS3 OneshotSource that allows copying in files from S3, e.g.

COPY INTO my_table FROM 's3://my-test-bucket' (FORMAT CSV, FILES = ['important.csv']);

Along with FILES = [<files>] we also support a PATTERN = <glob> option which allows copying multiple files all at once.

Motivation

Fixes https://github.com/MaterializeInc/database-issues/issues/8860
Fixes https://github.com/MaterializeInc/database-issues/issues/8855

Tips for reviewer

Review only the final commit, the one titled "start, implementation of an S3 oneshot source"

Checklist

• This PR has adequate test coverage / QA involvement has been duly considered. (trigger-ci for additional test/nightly runs)
• This PR has an associated up-to-date design doc, is a design doc (template), or is sufficiently small to not require a design.
• If this PR evolves an existing $T ⇔ Proto$T mapping (possibly in a backwards-incompatible way), then it is tagged with a T-proto label.
• If this PR will require changes to cloud orchestration or tests, there is a companion cloud PR to account for those changes that is tagged with the release-blocker label (example).
• If this PR includes major user-facing behavior changes, I have pinged the relevant PM to schedule a changelog post.