[Feature] Paimon Rust

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/paimon/issues) and found nothing similar.

### Motivation

It's extremely difficult for non-JVM languages like Rust and Python to interact with Paimon tables.

If we implement Paimon in Rust, it will enable a lot of use cases.

For instance, we could facilitate reading and writing Paimon data within [Databend](https://github.com/datafuselabs/databend/) (in Rust) and [DuckDB](https://github.com/duckdb/duckdb) (in C++). Additionally, by creating `paimon-py` based on `paimon-rust`, we can make Paimon accessible in Python environments.

### Solution

Create a pure rust implementation of the paimon spec similar to Iceberg project: [iceberg-rust](https://github.com/apache/iceberg-rust).

### Anything else?

I'm willing to help make it happen. We can start by creating a `paimon-rust` repo.

### Are you willing to submit a PR?

- [X] I'm willing to submit a PR!

No repository files or tests are named. Start by reviewing the Paimon specification and the referenced iceberg-rust project, then define the scope for a separate paimon-rust implementation; done would require an agreed implementation plan and a Rust project capable of interacting with Paimon tables.

Written by the indexing model from the issue text.