rust-cli / config-rs / 18139561369

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feat: Improve errors from try_deserialize (#695)

Enables user code to handle missing and invalid fields after calling
try_deserialize instead of having to match and search in the string
returned in `ConfigError::Message`.

Personally I deem the `String::leak` call safe for my usage, as I would
expect to terminate my program on configuration errors anyhow, however
we could certainly also change the `expected` field to be a `Cow<str>`
or similar to handle both `&'static str` and `String` elegantly.

Part of #532

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