*NoBound derives should use fully qualified paths

[benluelo]

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Description of bug

Since the *NoBound derives don't use fully qualified paths when referring to core (

polkadot-sdk/substrate/frame/support/procedural/src/no_bound/partial_eq.rs

Line 131 in 7d3ce4d

impl #impl_generics core::cmp::PartialEq for #name #ty_generics #where_clause {

), if there is a module called core in scope it will break.

error[E0433]: failed to resolve: could not find `cmp` in `core`
   --> voyager/src/msg.rs:659:42
    |
659 |     #[derive(DebugNoBound, CloneNoBound, PartialEqNoBound, Serialize, Deserialize)]
    |                                          ^^^^^^^^^^^^^^^^ could not find `cmp` in `core`
    |
    = note: this error originates in the derive macro `PartialEqNoBound` (in Nightly builds, run with -Z macro-backtrace for more info)
help: consider importing one of these items
    |
549 +     use core::cmp;
    |
549 +     use pin_utils::core_reexport::cmp;
    |
549 +     use std::cmp;
    |
help: if you import `cmp`, refer to it directly

Steps to reproduce

No response