Build/link to Rust iceberg-c library

[lidavidm]

Requires apache/iceberg-rust#966 with changes from https://github.com/lidavidm/iceberg-rust/tree/add-c-binding.

[Xuanwo]

Hi, @lidavidm, maybe we should link against the iceberg-rust cpp bindings? I'll prepare another PR to demonstrate how CXX works.

[wgtmac]

Do we need to make iceberg library mainly interface-oriented and add a new iceberg-rust-cxx-binding library to plug in the implementation? It is still unclear to me the extent of plug-ability in this approach.

[lidavidm]

It depends on if we want to use Rust definitions for things like data types too, or if we just want to use it to implement talking to catalogs etc.

[wgtmac]

I think that leveraging rust library is a good approach to move fast. However, there are still users that don't have a rust toolchain, or do not want to add extra dependencies introduced by the rust library.

[lidavidm]

For sure, I just wanted to prove that the CMake work I did on the other side works properly.