Add #[garde(allow_unvalidated)]

[jprochazk]

Currently, the following will fail to compile:

#[derive(Validate)]
struct Foo {
  value: String,
}

The user has to add #[garde(skip)] if they don't intend to validate the value field. It should instead be possible to add #[garde(allow_unvalidated)] to the struct at the top level which would ignore these errors for all fields. This is useful when there are many fields which the user doesn't want to validate. Currently, you have to add #[garde(skip)] to each one, which can get verbose very quickly.

#[derive(Validate)]
struct Foo {
  #[garde(length(min=1))]
  bar: String,
  #[garde(skip)]
  baz: i32,
  #[garde(skip)]
  qux: Qux,
  #[garde(skip)]
  fred: Etc,
}

#[derive(Validate)]
#[garde(allow_unvalidated)]
struct Foo {
  #[garde(length(min=1))]
  bar: String,
  baz: i32,
  qux: Qux,
  fred: Etc,
}

[jprochazk]

Added in v0.12.