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.

2 files changed, 82 insertions, 0 deletions

diff --git a/vendor/github.com/google/yamlfmt/internal/features/eof_newline.go b/vendor/github.com/google/yamlfmt/internal/features/eof_newline.go
new file mode 100644
index 00000000..d77c3905
--- /dev/null
+++ b/vendor/github.com/google/yamlfmt/internal/features/eof_newline.go
@@ -0,0 +1,39 @@
+// 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 features
+
+import (
+	"context"
+
+	"github.com/google/yamlfmt"
+)
+
+func MakeFeatureEOFNewline(linebreakStr string) yamlfmt.Feature {
+	return yamlfmt.Feature{
+		Name:        "EOF Newline",
+		AfterAction: eofNewlineFeature(linebreakStr),
+	}
+}
+
+func eofNewlineFeature(linebreakStr string) yamlfmt.FeatureFunc {
+	return func(_ context.Context, content []byte) (context.Context, []byte, error) {
+		// This check works in both linebreak modes.
+		if len(content) == 0 || content[len(content)-1] != '\n' {
+			linebreakBytes := []byte(linebreakStr)
+			content = append(content, linebreakBytes...)
+		}
+		return nil, content, nil
+	}
+}
diff --git a/vendor/github.com/google/yamlfmt/internal/features/trim_whitespace.go b/vendor/github.com/google/yamlfmt/internal/features/trim_whitespace.go
new file mode 100644
index 00000000..7b5bd636
--- /dev/null
+++ b/vendor/github.com/google/yamlfmt/internal/features/trim_whitespace.go
@@ -0,0 +1,43 @@
+// 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 features
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"strings"
+
+	"github.com/google/yamlfmt"
+)
+
+func MakeFeatureTrimTrailingWhitespace(linebreakStr string) yamlfmt.Feature {
+	return yamlfmt.Feature{
+		Name:         "Trim Trailing Whitespace",
+		BeforeAction: trimTrailingWhitespaceFeature(linebreakStr),
+	}
+}
+
+func trimTrailingWhitespaceFeature(linebreakStr string) yamlfmt.FeatureFunc {
+	return func(_ context.Context, content []byte) (context.Context, []byte, error) {
+		buf := bytes.NewBuffer(content)
+		s := bufio.NewScanner(buf)
+		newLines := []string{}
+		for s.Scan() {
+			newLines = append(newLines, strings.TrimRight(s.Text(), " "))
+		}
+		return nil, []byte(strings.Join(newLines, linebreakStr)), nil
+	}
+}