prefix config attribute is not compatible with config(nest)

[N4D1K-lgtm]

Using #[config(prefix = "your_prefix")] on a field in combination with #[config(nest)] should pass the provided prefix to allow reusing config structs. A simple example:

#[derive(Config, Default)]
struct Nested {
    #[config(prefix = "inner_override")]
    name: String,
    detail: String,
}

#[derive(Config, Default)]
#[config(prefix = "TEST")]
struct NestedTest {
    id: i32,
    #[config(nest, prefix = "NESTED")]
    nested: Nested,
}

This should result in the env variable for Nested.detail to be NESTED_DETAIL