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Issue: Missing authentication support for "none" auth type and RestCatalog integration

Issue: Missing authentication support for "none" auth type and RestCatalog integration: a task in LegoFlow-SWE (Harbor dataset). The Iceberg C++ REST catalog currently does not integrate an authentication layer into its HTTP requests. It also lacks a proper handling of the rest.auth-type property…

The task

The Iceberg C++ REST catalog currently does not integrate an authentication layer into its HTTP requests. It also lacks a proper handling of the `rest.auth-type` property, especially the `"none"` (no‑op) authentication mode. As a result:

Part of Lego-X/LegoFlow-SWE.