Remove support for expression ignore in ToSchema and IntoParams - #1619

This commit removes support for expression style ignore attribute from ToSchema and IntoParams macro. This is to fix issue where ignore sometimes did not ignore values, because it was evaluated in runtime and function reference ignore can be evaluated only during runtime but we need to evaluate this at build time thus removing the possibility to define function reference as ignore attribute value.

Breaking

Following syntax demonstrates what was allowed before, but will be not available in new version 6.

// before allowed

fn ignore_always() -> bool {
  true
}

#[derive(ToSchema)]
struct Value {
  #[schema(ignore = ignore_always)]
  field: String
}