Convert Iceberg to TrinoFileSystem interface

[electrum]

Description

Is this change a fix, improvement, new feature, refactoring, or other?

refactoring

Related issues, pull requests, and links

First commit is extracted to https://github.com/trinodb/trino/pull/13361

Documentation

(x) No documentation is needed.

Release notes

(x) No release notes entries required.

[findepi]

cc @ebyhr @alexjo2144 @findinpath @homar

[findinpath]

Overall this PR brings a more elegant approach to dealing with the file system. The only thing I'm not sure of being an improvement is using String instead of Path for passing the file path.