feat: Add initial AuthzQuerier implementation (#5919)

feat: Add initial AuthzQuerier implementation
- Adds package database/dbauthz that adds a database.Store implementation where each method goes through AuthZ checks
- Implements all database.Store methods on AuthzQuerier
- Updates and fixes unit tests where required
- Updates coderd initialization to use AuthzQuerier if codersdk.ExperimentAuthzQuerier is enabled

coderd/rbac/error_test.go

@@ -0,0 +1,32 @@
+package rbac_test
+
+import (
+	"testing"
+
+	"github.com/coder/coder/coderd/rbac"
+
+	"github.com/stretchr/testify/require"
+	"golang.org/x/xerrors"
+)
+
+func TestIsUnauthorizedError(t *testing.T) {
+	t.Parallel()
+	t.Run("NotWrapped", func(t *testing.T) {
+		t.Parallel()
+		errFunc := func() error {
+			return rbac.UnauthorizedError{}
+		}
+
+		err := errFunc()
+		require.True(t, rbac.IsUnauthorizedError(err))
+	})
+
+	t.Run("Wrapped", func(t *testing.T) {
+		t.Parallel()
+		errFunc := func() error {
+			return xerrors.Errorf("test error: %w", rbac.UnauthorizedError{})
+		}
+		err := errFunc()
+		require.True(t, rbac.IsUnauthorizedError(err))
+	})
+}