Make Storage a Trait - Phase 1 #2051

What's the feature are you trying to implement?

As described in the rfc: https://github.com/apache/iceberg-rust/blob/main/docs/rfcs/0002_storage_trait.md

This issue serves as a parent issue to track the work needed for phase 1: introducing Storage trait to iceberg crate

Willingness to contribute

I can contribute to this feature independently