feat: migrate from Cedar to SpiceDB authorization system

This is a major architectural change that replaces the Cedar policy-based
authorization system with SpiceDB's relation-based authorization.

Key changes:

- Migrate from Rust to Go implementation
- Replace Cedar policies with SpiceDB schema and relationships
- Switch from envoy `ext_authz` with Cedar to SpiceDB permission checks
- Update build system and dependencies for Go ecosystem
- Maintain Envoy integration for external authorization

This change enables more flexible permission modeling through SpiceDB's
Google Zanzibar inspired relation-based system, supporting complex
hierarchical permissions that were difficult to express in Cedar.

Breaking change: Existing Cedar policies and Rust-based configuration
will no longer work and need to be migrated to SpiceDB schema.

1 files changed, 0 insertions, 39 deletions

diff --git a/vendor/itertools/src/cons_tuples_impl.rs b/vendor/itertools/src/cons_tuples_impl.rs
deleted file mode 100644
index 7e86260b..00000000
--- a/vendor/itertools/src/cons_tuples_impl.rs
+++ /dev/null
@@ -1,39 +0,0 @@
-use crate::adaptors::map::{MapSpecialCase, MapSpecialCaseFn};
-
-macro_rules! impl_cons_iter(
-    ($_A:ident, $_B:ident, ) => (); // stop
-
-    ($A:ident, $($B:ident,)*) => (
-        impl_cons_iter!($($B,)*);
-        #[allow(non_snake_case)]
-        impl<$($B),*, X> MapSpecialCaseFn<(($($B,)*), X)> for ConsTuplesFn {
-            type Out = ($($B,)* X, );
-            fn call(&mut self, (($($B,)*), X): (($($B,)*), X)) -> Self::Out {
-                ($($B,)* X, )
-            }
-        }
-    );
-);
-
-impl_cons_iter!(A, B, C, D, E, F, G, H, I, J, K, L,);
-
-#[derive(Debug, Clone)]
-pub struct ConsTuplesFn;
-
-/// An iterator that maps an iterator of tuples like
-/// `((A, B), C)` to an iterator of `(A, B, C)`.
-///
-/// Used by the `iproduct!()` macro.
-pub type ConsTuples<I> = MapSpecialCase<I, ConsTuplesFn>;
-
-/// Create an iterator that maps for example iterators of
-/// `((A, B), C)` to `(A, B, C)`.
-pub fn cons_tuples<I>(iterable: I) -> ConsTuples<I::IntoIter>
-where
-    I: IntoIterator,
-{
-    ConsTuples {
-        iter: iterable.into_iter(),
-        f: ConsTuplesFn,
-    }
-}