Derive Macro CloneTypeIntoContext 

#[derive(CloneTypeIntoContext)]

Implement CloneTypeIntoContext for a Type by delegating to its own CloneIntoContext impl, then re-interning the clone into dst_ctx.

The type must already implement CloneIntoContext (e.g. via #[derive(CloneIntoContext)], or impl_clone_into_context_for_clone!).

Usage:

use pliron::{
    context::Context,
    derive::{CloneIntoContext, CloneTypeIntoContext, pliron_type},
    irbuild::decontext::CloneIntoContext as _, printable::Printable,
};

#[pliron_type(
    name = "test.point_type",
    format = "`<` $x `>`",
    generate_get = true,
    verifier = "succ"
)]
#[derive(Debug, Clone, PartialEq, Eq, Hash, CloneIntoContext, CloneTypeIntoContext)]
struct PointType {
    x: i32,
}

let src_ctx = Context::new();
let mut dst_ctx = Context::new();
let p = PointType::get(&src_ctx, 1).to_handle();
let p2 = p.clone_into_context(&src_ctx, &mut dst_ctx);
assert_eq!(p.disp(&src_ctx).to_string(), p2.disp(&dst_ctx).to_string());