Support datafusion-cli access to public S3 buckets that do not require authentication (#16300)

* Support datafusion-cli access to public S3 buckets that do not require authentication

* improve docs

* clippy and test

* Update test

* Update datafusion-cli/Cargo.toml

Co-authored-by: Dmitrii Blaginin <[email protected]>

* Only use unsigned requests on `CredentialsError::CredentialsNotLoaded`

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Co-authored-by: Dmitrii Blaginin <[email protected]>

Author: alamb

Cargo.lock

@@ -55,6 +55,7 @@ datafusion = { workspace = true, features = [
 dirs = "6.0.0"
 env_logger = { workspace = true }
 futures = { workspace = true }
+log = { workspace = true }
 mimalloc = { version = "0.1", default-features = false }
 object_store = { workspace = true, features = ["aws", "gcp", "http"] }
 parking_lot = { workspace = true }