Interned struct with 7 fields or more leads to `clippy::too_many_arguments`

[sharkdp]

When a salsa::interned struct has 7 fields or more, clippy issues a too_many_arguments diagnostic for generated code that can not be silenced by a local #[allow(clippy::too_many_arguments)].

To reproduce, add the following struct to e.g. tests/interned-structs.rs:

#[salsa::interned(debug)]
struct ManyFields<'db> {
    x1: u32,
    x2: u32,
    x3: u32,
    x4: u32,
    x5: u32,
    x6: u32,
    x7: u32,
}

and run clippy:

▶ cargo clippy --all-targets                
    Checking salsa v0.19.0 (/home/shark/salsa)
warning: this function has too many arguments (8/7)
  --> tests/interned-structs.rs:20:1
   |
20 | #[salsa::interned(debug)]
   | ^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#too_many_arguments
   = note: `#[warn(clippy::too_many_arguments)]` on by default
   = note: this warning originates in the macro `salsa::plumbing::setup_interned_struct` which comes from the expansion of the attribute macro `salsa::interned` (in Nightly builds, run with -Z macro-backtrace for more info)

warning: `salsa` (test "interned-structs") generated 1 warning

It would be good if salsa would take care of this automatically, or allow users to silence the clippy warning without having to disable this lint globally.