faet: enhance not found errors with suggestions

[camilesing]

for issue: #5642

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[wjones127]

Nice start on this. One note is I still think we should put the similarity computation in the Display implementation of the error. You can implement a custom error struct:

struct MyError {
   ...
}


impl std::fmt::Display for MyError {
    ...
}

And then use the #[snafu(transparent)] macro in Snafu to make it one of the variants:

enum Error {
    ...
    #[snafu(transparent)]
    MyError { source: MyError },
    ...
}