Feature Request: Snapshot root directory configuration

[cosmikwolf]

It would be great to be able to set a directory to be the snapshot root directory, such as /tests/snapshots

This would make it possible to use snapshots in unit tests, without creating a bunch of files and directories in the src dir.

The snapshots root could replicate the necessary directory structure relative to the root dir within the snapshots root dir to ensure it maps properly to the crate root.

[mitsuhiko]

You can already do this with settings:

let mut settings = Settings::clone_current();
settings.set_snapshot_path("../tests/snapshots");
let _guard = settings.bind_to_scope();

Is this sufficient for your needs?