feat: rust examples for creating and querying Paimon tables

[ganesh-skumar]

Purpose

Add Rust examples demonstrating how to create a Paimon table with sample data and query it using DataFusion.

Brief change log

• Add create_table.rs example to create a Paimon table and insert sample data.
• Add datafusion_query.rs example demonstrating the DataFusion DataFrame API.
• Add paimon-datafusion as a workspace dependency for the examples.

[ganesh-skumar]

Hi, While checking the CI failure, the rust examples require adding paimon-datafusion and datafusion dependencies to paimon crate because they're located under crates/paimon/examples. As a result, the generated DEPENDENCIES.rust.tsv files also need to be updated.

I was wondering whether it would be more appropriate to place these examples in a separate example crate to avoid introducing these additional dependencies into the core paimon crate.

Or is updating the generated DEPENDENCIES.rust.tsv files the expected approach in this case?

Thanks!