Show full type path for type mismatch same type

```rust
mod foo {
    pub struct S;
}
mod bar {
    pub struct S;
}
fn test(_: foo::S) {
    test(bar::S);
}
```

Output `expected S, found S (rust-analyzer E0308)`

If `expected==found`, outputting `expected foo::S, found bar::S` would be even better

Furthermore, `expected Vec<S>, found Vec<S>` -> `expected Vec<foo::S>, found Vec<bar::S>`
