delegation: remove method call generation

[aerooneqq]

This PR removes method call generation from delegations, now we always generate default call. Part of #118212.

We reuse methods probing engine for finding needed adjustments, thus extending number of supported cases. In this PR adjustments are applied to trait methods (was supported before) and static functions (new feature). Free functions can be supported later.

Example of static trait functions reuses that are now working:

trait Trait: Sized {
    fn static_value(_: Self) -> i32 { 1 }
    fn static_mut_ref(_: &mut Self) -> i32 { 2 }
    fn static_ref(_: &Self) -> i32 { 3 }
}

#[derive(Default)]
struct F;
impl Trait for F {}

struct S;

impl Trait for S {
    reuse <F as Trait>::{static_value, static_mut_ref, static_ref} { F }
}

fn main() {
    assert_eq!(S::static_ref(&S), 3);
    assert_eq!(S::static_mut_ref(&mut S), 2);
    assert_eq!(S::static_value(S), 1);
}

Finally this PR solves issues from parent generics propagation from #155906.

r? @petrochenkov