FileManager should be controlled by nargo

[phated]

Problem

Currently, the FileManager is defaulted in noirc_frontend::hir::Context. This has lead to a poor API in #1598 where I needed to add file_manager() -> &FileManager to get a reference to the internal files and report warnings/errors from compilation.

Happy Case

The FileManager should be constructed outside the driver and passed in by reference. This way, the code creating a driver (such as nargo_cli) is in control of the FileManager itself.

Alternatives Considered

No response

Additional Context

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Would you like to submit a PR for this Issue?

No

Support Needs

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