Introduce new command to generate kubeconfig

```
sveltosctl generate kubeconfig --help
Usage:
  sveltosctl generate kubeconfig [options] [--namespace=<name>] [--serviceaccount=<name>] [--create] [--verbose]

     --namespace=<name>      The namespace of the ServiceAccount. If not specified, projectsveltos namespace will be used.
     --serviceaccount=<name> The name of the ServiceAccount. If not specified, projectsveltos will be used.
     --create                If a ServiceAccount with enough permissions is already present, do not set this flag.
                             Sveltos will generate a Kubeconfig associated to that ServiceAccount.
                             If a ServiceAccount with cluster admin permissions needs to be created, use this option.
                             When this option is set, this command will create necessary resources:
                             1. namespace if not existing already
                             2. serviceAccount if not existing already
                             3. ClusterRole with cluster admin permission
                             4. ClusterRoleBinding granting the serviceAccount cluster admin permissions
                             5. TokenRequest for the ServiceAccount

Options:
  -h --help                  Show this screen.
     --verbose               Verbose mode. Print each step.

Description:
  The generate kubeconfig command will generate a Kubeconfig that can later on be used to register the cluster.
```

cmd/sveltosctl/main.go

@@ -48,6 +48,8 @@ func main() {
     snapshot       Displays collected snaphost. Visualize diffs between two collected snapshots.
     techsupport    Displays collected techsupport.
     register       Onboard an existing non CAPI cluster by creating all necessary internal resources.
+    generate       Generates a Kubeconfig that can later be used to register a cluster.
+                   Run this command with sveltosctl pointing to the cluster you want Sveltos to manage.
     log-level      Allows changing the log verbosity.
     version        Display the version of sveltosctl.
 
@@ -105,6 +107,8 @@ Description:
 			err = commands.Techsupport(ctx, args, logger)
 		case "register":
 			err = commands.RegisterCluster(ctx, args, logger)
+		case "generate":
+			err = commands.Generate(ctx, args, logger)
 		case "log-level":
 			err = commands.LogLevel(ctx, args, logger)
 		case "version":

internal/commands/generate.go

@@ -0,0 +1,78 @@
+/*
+Copyright 2024. projectsveltos.io. All rights reserved.
+
+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 commands
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"os"
+	"strings"
+
+	docopt "github.com/docopt/docopt-go"
+	"github.com/go-logr/logr"
+
+	logs "github.com/projectsveltos/libsveltos/lib/logsettings"
+	"github.com/projectsveltos/sveltosctl/internal/commands/generate"
+)
+
+// Generate takes care generating a kubeconfig
+func Generate(ctx context.Context, args []string, logger logr.Logger) error {
+	doc := `Usage:
+	sveltosctl generate <command> [<args>...]
+
+        kubeconfig    Generates a Kubeconfig. The generated Kubeconfig can then be used to register a cluster.
+                      Run this command while pointing to the managed cluster.
+
+Options:
+	-h --help      Show this screen.
+
+Description:
+	See 'sveltosctl generate kubeconfig --help' to read about a specific subcommand.
+  `
+
+	parser := &docopt.Parser{
+		HelpHandler:   docopt.PrintHelpAndExit,
+		OptionsFirst:  true,
+		SkipHelpFlags: false,
+	}
+
+	opts, err := parser.ParseArgs(doc, nil, "1.0")
+	if err != nil {
+		var userError docopt.UserError
+		if errors.As(err, &userError) {
+			logger.V(logs.LogInfo).Info(fmt.Sprintf(
+				"Invalid option: 'sveltosctl %s'. Use flag '--help' to read about a specific subcommand.\n",
+				strings.Join(os.Args[1:], " "),
+			))
+		}
+		os.Exit(1)
+	}
+
+	command := opts["<command>"].(string)
+	arguments := append([]string{"logLevel", command}, opts["<args>"].([]string)...)
+
+	switch command {
+	case "kubeconfig":
+		return generate.GenerateKubeconfig(ctx, arguments, logger)
+	default:
+		//nolint: forbidigo // print doc
+		fmt.Println(doc)
+	}
+
+	return nil
+}

internal/commands/generate/export_test.go

@@ -0,0 +1,27 @@
+/*
+Copyright 2024. projectsveltos.io. All rights reserved.
+
+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 generate
+
+const (
+	Projectsveltos = projectsveltos
+)
+
+var (
+	CreateNamespace          = createNamespace
+	CreateClusterRole        = createClusterRole
+	CreateClusterRoleBinding = createClusterRoleBinding
+)