Add support for namespace mutations

Adds support for: Get, Create, Update, Delete

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

vendor/golang.org/x/sync/errgroup/errgroup.go

@@ -20,7 +20,7 @@ type token struct{}
 // A zero Group is valid, has no limit on the number of active goroutines,
 // and does not cancel on error.
 type Group struct {
-	cancel func()
+	cancel func(error)
 
 	wg sync.WaitGroup
 
@@ -43,7 +43,7 @@ func (g *Group) done() {
 // returns a non-nil error or the first time Wait returns, whichever occurs
 // first.
 func WithContext(ctx context.Context) (*Group, context.Context) {
-	ctx, cancel := context.WithCancel(ctx)
+	ctx, cancel := withCancelCause(ctx)
 	return &Group{cancel: cancel}, ctx
 }
 
@@ -52,7 +52,7 @@ func WithContext(ctx context.Context) (*Group, context.Context) {
 func (g *Group) Wait() error {
 	g.wg.Wait()
 	if g.cancel != nil {
-		g.cancel()
+		g.cancel(g.err)
 	}
 	return g.err
 }
@@ -76,7 +76,7 @@ func (g *Group) Go(f func() error) {
 			g.errOnce.Do(func() {
 				g.err = err
 				if g.cancel != nil {
-					g.cancel()
+					g.cancel(g.err)
 				}
 			})
 		}
@@ -105,7 +105,7 @@ func (g *Group) TryGo(f func() error) bool {
 			g.errOnce.Do(func() {
 				g.err = err
 				if g.cancel != nil {
-					g.cancel()
+					g.cancel(g.err)
 				}
 			})
 		}

vendor/golang.org/x/sync/errgroup/go120.go

@@ -0,0 +1,14 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build go1.20
+// +build go1.20
+
+package errgroup
+
+import "context"
+
+func withCancelCause(parent context.Context) (context.Context, func(error)) {
+	return context.WithCancelCause(parent)
+}

vendor/golang.org/x/sync/errgroup/pre_go120.go

@@ -0,0 +1,15 @@
+// Copyright 2023 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !go1.20
+// +build !go1.20
+
+package errgroup
+
+import "context"
+
+func withCancelCause(parent context.Context) (context.Context, func(error)) {
+	ctx, cancel := context.WithCancel(parent)
+	return ctx, func(error) { cancel() }
+}