Clippy duplicate attribute error on same types in generics

```rust
#[auto_*(
    generics(usize, usize)
)]
```

Clippy expects each meta key to be unique 

We should add support for:

```rust
#[auto_*(
    generics(T1 = usize, T2 = usize)
)]
```

~~Or~~ 

```rust
// types could be tuples so this is not viable
#[auto_*(
    generics((usize, usize))
)]
```