New Architecture upgrade: dependency guidance

Description

Improve the documentation concerning if my dependencies need to support the new architecture before I can switch.

What is the problem?

It is unclear to me if all my dependencies with Native code need to support the new architecture before I can switch my app across.
While the docs don't mention this one way or the other, there is much discussion across the ecosystem about new libraries moving to the new architecture.

How can we address it?

Add a section to https://reactnative.dev/docs/next/new-architecture-app-intro clarifying. If you need everything to support the new architecture, it would be great if there was a tool or command I could use to check this easily.

Why is it important?

Save time and questions from the community when they try to switch

Who needs this?

App developers

When should this happen (use version numbers if needed)?

By 0.70 preferably as it feels like that's going to have a big New Architecture push.

Start with the linked new-architecture-app-intro page and compare its current guidance with the question in this issue. Update the documentation to clarify the dependency requirement before switching and address whether a tool or command can help developers check compatibility.