[yuyi98]

This PR check error of implementing other module private interface (fix #19620).

• Check error of implementing other module private interface.
• Add test.

// sub module
module baz

interface Foo {
	a int
}

pub fn print_foo(f Foo) {
	println(f.a)
}

module main
import baz

fn main() {
	b := Bar{10}
	baz.print_foo(b) // prints 10
}

struct Bar {
	a int
}

PS D:\Test\v\tt1> v run .    
tt1.v:6:16: error: `Bar` cannot implement private interface `baz.Foo` of other module
    4 | fn main() {
    5 |     b := Bar{10}
    6 |     baz.print_foo(b) // prints 10
      |                   ^
    7 | }
    8 |

[spytheman]

Excellent work.