LsmWriteSpec

This release brings MemWAL LSM surface parity across SDKs and introduces first-class function wire contracts. It also includes several bug fixes and refactors, with a breaking change requiring pydantic v2 for the Python package.

This release introduces several new features including custom stop-word lists for FTS, a RemoteTable fetch_blobs client, and connection-level job operations. It also includes numerous bug fixes across Python, Rust, and Node.js, along with breaking changes to the `add_columns` function in Rust and Python.