Gpiozero Flow adds streamlined support for flow sensor projects

Gpiozero Flow is a new addition to the Gpiozero library ecosystem. It provides a straightforward API for working with flow sensors. The feature targets developers building Raspberry Pi projects that monitor fluid movement. It abstracts low‑level hardware interactions into easy‑to‑use functions. Documentation includes examples for common sensor types and wiring setups. The extension aims to reduce development time for hobbyist and professional users. Compatibility with existing Gpiozero components is maintained. Users are encouraged to test the module and contribute feedback to the project.