Enhancement: move from azure.ai.formrecognizer package to azure.ai.documentintelligence

# Motivation

New package is now GA.

# How would you feel if this feature request was implemented?

It is not the most important feature for sure but I think that in the long term will make us leverage the most out of the service (new apis and capabilities and so on)

# Requirements

I think only following the migration guide should suffice: https://github.com/Azure/azure-sdk-for-python/blob/main/sdk/documentintelligence/azure-ai-documentintelligence/MIGRATION_GUIDE.md

# Tasks

_To be filled in by the engineer picking up the issue_

- [ ] Task 1
- [ ] Task 2
- [ ] ...