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, 40 insertions, 0 deletions

diff --git a/vendor/github.com/google/yamlfmt/engine/errors.go b/vendor/github.com/google/yamlfmt/engine/errors.go
new file mode 100644
index 00000000..27dbba15
--- /dev/null
+++ b/vendor/github.com/google/yamlfmt/engine/errors.go
@@ -0,0 +1,40 @@
+// Copyright 2022 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 engine
+
+import "fmt"
+
+type FormatErrors []*FormatError
+
+func (e FormatErrors) Error() string {
+	errStr := "encountered the following formatting errors:\n"
+	for _, err := range e {
+		errStr += fmt.Sprintf("%s\n", err.Error())
+	}
+	return errStr
+}
+
+type FormatError struct {
+	path string
+	err  error
+}
+
+func wrapFormatError(path string, err error) *FormatError {
+	return &FormatError{path: path, err: err}
+}
+
+func (e *FormatError) Error() string {
+	return fmt.Sprintf("%s: %v", e.path, e.err)
+}