Implement an `all` function

Not sure if these functions would be truly useful. Need to start using `lamb` on different contexts. 

---

```gleam
pub fn all(from table: Table(index, record)) -> List(#(index, record)) {
  ffi_tab2list(table.reference)
}

@external(erlang, "ets", "tab2list")
fn ffi_tab2list(table: TableId) -> List(record)
```