Use fs_err to get more helpful messages on fs errors

[atezet]

Use fs-err as a drop-in replacement of fs to get more helpful messages on errors.

Before:

  thread 'main' (2647180) panicked at [..]/memory-serve/src/build/mod.rs:52:14:
  Could not canonicalize the provided path: Os { code: 2, kind: NotFound, message: "No such file or directory" }

After:

  thread 'main' (2660599) panicked at [..]memory-serve/src/build/mod.rs:51:14:
  Could not canonicalize the provided path: Custom { kind: NotFound, error: Error { kind: Canonicalize, source: Os { code: 2, kind: NotFound, message: "No such file or directory" }, path: "../frontend/dist-storybook" } }

[marlonbaeten]

Cool - thank you!