Add value field to ErrorKind::UnexpectedValue

[baszalmstra]

Checklist

• I have read the Contributor Guide
• I have read and agree to the Code of Conduct
• I have added a description of my changes and why I'd like them included in the section below

Description of Changes

Besides showing which values are supported when parsing an enum I would also like to show the user a help message when the user specified value is "very close" to one of the possible values. To do that, I need to be able to access the value in the error handler.

E.g.

× Expected one of 'first-index', 'unsafe-first-match', 'unsafe-best-match'
   ╭─[file.toml:2:27]
 1 │ 
 2 │         index-strategy = "UnsafeFirstMatch"
   ·                           ────────────────
 3 │         
   ╰────
help: Did you mean 'unsafe-first-match'? 

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