Cirq Google Plugin

Cirq Google (`cirq-google`) is the module for the Cirq quantum computing framework that provides tools and access to the Google Quantum Computing Service. It enables users to run quantum circuits on Google's quantum processors and high-performance simulators. The current version is 1.6.1, and it typically releases new versions in sync with the main `cirq` library, which has a release cadence of monthly/bi-monthly patches and quarterly minor versions.