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, 65 insertions, 0 deletions

diff --git a/vendor/github.com/google/yamlfmt/formatter.go b/vendor/github.com/google/yamlfmt/formatter.go
new file mode 100644
index 00000000..ce432ee8
--- /dev/null
+++ b/vendor/github.com/google/yamlfmt/formatter.go
@@ -0,0 +1,65 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package yamlfmt
+
+import "fmt"
+
+type Formatter interface {
+	Type() string
+	Format(yamlContent []byte) ([]byte, error)
+	ConfigMap() (map[string]any, error)
+}
+
+type Factory interface {
+	Type() string
+	NewFormatter(config map[string]interface{}) (Formatter, error)
+}
+
+type Registry struct {
+	registry    map[string]Factory
+	defaultType string
+}
+
+func NewFormatterRegistry(defaultFactory Factory) *Registry {
+	return &Registry{
+		registry: map[string]Factory{
+			defaultFactory.Type(): defaultFactory,
+		},
+		defaultType: defaultFactory.Type(),
+	}
+}
+
+func (r *Registry) Add(f Factory) {
+	r.registry[f.Type()] = f
+}
+
+func (r *Registry) GetFactory(fType string) (Factory, error) {
+	if fType == "" {
+		return r.GetDefaultFactory()
+	}
+	factory, ok := r.registry[fType]
+	if !ok {
+		return nil, fmt.Errorf("no formatter registered with type \"%s\"", fType)
+	}
+	return factory, nil
+}
+
+func (r *Registry) GetDefaultFactory() (Factory, error) {
+	factory, ok := r.registry[r.defaultType]
+	if !ok {
+		return nil, fmt.Errorf("no default formatter registered for type \"%s\"", r.defaultType)
+	}
+	return factory, nil
+}