Expose files dependencies in createProjectFileMapUsingProjectGraph

[huv1k]

There are two options for how to get fileMap that can be used for various 3rd party tooling like better circular dependency in our case, but publicly exposed createProjectFileMapUsingProjectGraph from @nx/devkit doesn't provide any file dependencies even that is specified in Typescript types. If we compare it to readFileMapCache that is used inside Eslint plugin and exported from nx/src/project-graph/nx-deps-cache this implementation have it.

Can we expose the file dependencies from public API so we don't need to use internal implementations? 🤔