plusplusjiajia opened a new pull request, #3092:
URL: https://github.com/apache/iceberg-rust/pull/3092
## Which issue does this PR close?
Split out of [#2660](https://github.com/apache/iceberg-rust/pull/2660),
stacked on [#3082](https://github.com/apache/iceberg-rust/pull/3082) — the
first five commits are that PR and drop out once it merges.
## What changes are included in this PR?
`SigV4AuthManager` wires the signer into `AuthManager`/`AuthSession`,
following Java's `RESTSigV4AuthManager`:
- one credential-free signer serves every session, as Java's single
`Aws4Signer.create()` does;
- the **session** holds the credentials provider and resolves it **per
request**, like Java's `resolveCredentials()` inside `sign`, leaving caching to
the provider;
- the delegate authenticates first, so a bearer token is relocated to
`Original-Authorization` and signed over;
- every session method rebuilds from the properties it is given, as Java
builds a fresh `AwsProperties` in each.
Properties use Java's names: `rest.signing-region`, `rest.signing-name`
(default `execute-api`), `rest.access-key-id`, `rest.secret-access-key`,
`rest.session-toke
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