Add Quine trait to AST, make pretty public.

[sevki]

Product change and motivation

• feat:Make pretty public.
• fix: Pretty now prints annotations.
• fix: suppress some build warnings.
• feat: add derive(Quine) to AST members.

Implementation

Adds an optional quine derive feature to the package that will implement Quine
for the AST to make it possible for the ASTs to reproduce them selves.

[sevki]

ha. the annotation fix is already in. didn't realize that.

[flyingsilverfin]

Quine is a pretty old package - is it maintained?

[sevki]

it's polyquine, not quine. it's actually maintained. I've contributed a couple of patches to make this bit of code work

#[derive(Debug, Eq, PartialEq)]
#[cfg_attr(feature = "quine", derive(Quine), path_prefix(typeql::query::schema))]
pub struct Define {
    pub span: Option<Span>,
    pub definables: Vec<Definable>,
}