[FR] FastAPI Implementation for all services

Is your feature request related to a problem? Please describe. The current web server implementation for presidio-anonymizer is based on Flask. Flask operates synchronously by default and may not be the optimal choice for high-performance. We require an implementation that leverages a modern, asynchronous framework to improve performance and scalability.

Describe the solution you'd like We request an official implementation of the presidio-anonymizer using FastAPI. This would provide a high-performance alternative that supports asynchronous request handling, which is crucial for building scalable microservices.

Additional context Providing a FastAPI-based implementation would modernize the Presidio project, making it more attractive for deployment in high-throughput environments.