Check types of missing definition in add import quick suggestions

### Current behavior:

Even though the type of `toLower` is known from the context (`Char -> Char`), "quick fix" purposes to import functions that, despite having the same name, are known not to be correct type-wise (`Data.Text.Lazy (toLower)` for example).


### Proposed behavior:

When the type of the undefined function is fully known, filter quick fixes by type.