fix: add param on result methods for replace_method_eager_lazy

[A4-Tacks]

• Add some Result methods to minicore
• Migrate replace_method_eager_lazy to SyntaxEdutor

Example

fn foo() {
    let foo = Ok(1);
    return foo.unwrap_$0or(2);
}

Before this PR

fn foo() {
    let foo = Ok(1);
    return foo.unwrap_or_else(|| 2);
}

After this PR

fn foo() {
    let foo = Ok(1);
    return foo.unwrap_or_else(|${0:_}| 2);
}

[ChayimFriedman2]

I think it's better to name the param _ given it's not used, and also place a snippet on it.

View changes since this review

[A4-Tacks]

It seems good, I hope this won't break some habits