Point at the span for the definition of ADTs internal to the current
crate.

Look at the leading char of the ident to determine whether we're
expecting a likely fn or any of a fn, a tuple struct or a tuple variant.

Turn fn `add_typo_suggestion` into a `Resolver` method.

Include the kind of the binding that we're suggesting, and use a
structured suggestion.

Signed-off-by: NFreyskeyd <simon.paitrault@gmail.com>