fix: require generic trait impls to be in scope to call them

[asterite]

Description

Based on top of #6901

Problem

Part of #6864

Summary

Similar to the previous PRs, but for traits which are implemented over all types with an optional where clause, for example:

fn main() {
    let x: i32 = 1;
    let _ = x.foo(); // This will warn because there's no `use private_mod::Foo;`
}

mod private_mod {
    pub trait Foo<T> {
        fn foo(self) -> i32;
    }

    impl<T> Foo<T> for T {
        fn foo(self) -> i32 {
            42
        }
    }
}

This is the last one! 🎉

Additional Context

Documentation

Check one:

• No documentation needed.
• Documentation included in this PR.
• [For Experimental Features] Documentation to be submitted in a separate PR.

PR Checklist

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.

[github-actions]

Peak Memory Sample

Program	Peak Memory
keccak256	78.51M
workspace	123.83M
regression_4709	422.94M
ram_blowup_regression	1.58G
private-kernel-tail	168.30M
private-kernel-reset	168.33M
private-kernel-inner	168.30M
parity-root	151.61M

[github-actions]

Compilation Report

Program	Compilation Time	%
sha256_regression	1.300s	2%
regression_4709	0.802s	2%
ram_blowup_regression	18.480s	1%
rollup-base-public	35.320s	-2%
rollup-base-private	11.900s	1%
private-kernel-tail	1.059s	6%

[github-actions]

Execution Memory Report

Program	Peak Memory
keccak256	74.66M
workspace	123.75M
regression_4709	315.99M
ram_blowup_regression	512.41M
rollup-base-public	481.15M
rollup-base-private	327.48M
private-kernel-tail	180.89M
private-kernel-reset	249.56M
private-kernel-inner	209.73M

[github-actions]

Compilation Memory Report

Program	Peak Memory
keccak256	78.11M
workspace	123.89M
regression_4709	422.96M
ram_blowup_regression	1.58G
rollup-base-public	4.11G
rollup-base-private	1.20G
private-kernel-tail	207.04M
private-kernel-reset	730.46M
private-kernel-inner	294.26M

[github-actions]

Execution Report

Program	Execution Time	%
sha256_regression	0.054s	1%
regression_4709	0.001s	0%
ram_blowup_regression	0.577s	-1%
rollup-base-public	1.230s	1%
rollup-base-private	0.464s	1%
private-kernel-tail	0.022s	4%

[jfecher]

LGTM