Rename table function arrowflight to arrowFlight

Why it matters

This change standardizes the naming convention of the ClickHouse table function for Arrow Flight integration, making it more intuitive and aligned with common camelCase practices, which helps users avoid confusion and potential errors.

How to use it

Replace all usages of arrowflight with arrowFlight in your SQL queries and scripts. For example, use SELECT * FROM arrowFlight(...) instead of SELECT * FROM arrowflight(...).