dvc: s3: allow configuring anonymous access

[2maz]

• [x] ❗ I have followed the Contributing to DVC checklist.

• [x] 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.

see:

• https://github.com/iterative/dvc.org/pull/5229
• https://github.com/iterative/dvc-s3/pull/85

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 90.49%. Comparing base (cbaeff2) to head (f7fd9e9).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10407 +/- ## ========================================== + Coverage 90.34% 90.49% +0.14% ========================================== Files 480 502 +22 Lines 35893 38982 +3089 Branches 4135 5309 +1174 ========================================== + Hits 32426 35275 +2849 - Misses 2870 3012 +142 - Partials 597 695 +98 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[dberenbaum]

Can we also change pyproject.toml to require dvc-s3>=3.2.0?