refactor: move handler directories (#1321)

**What problem does this PR solve?**:
Moving the handlers and docs around to make it clear when adding new
providers and new handlers if they apply to all providers or only those
that use kubeadm too bootstrap the Nodes.

This better aligns with the changes in
#1297

**Which issue(s) this PR fixes**:
Fixes #

**How Has This Been Tested?**:
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Author: dkoshkin

cmd/main.go

@@ -42,7 +42,7 @@ import (
 	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/docker"
 	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/eks"
 	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/generic"
-	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/generic/lifecycle"
+	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/lifecycle"
 	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/nutanix"
 	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/handlers/options"
 	"github.com/nutanix-cloud-native/cluster-api-runtime-extensions-nutanix/pkg/webhook/addons"
@@ -109,7 +109,7 @@ func main() {
 
 	globalOptions := options.NewGlobalOptions()
 
-	genericLifecycleHandlers := lifecycle.New(globalOptions)
+	lifecycleHandlers := lifecycle.New(globalOptions)
 
 	// awsMetaHandlers combines all AWS patch and variable handlers under a single handler.
 	// It allows to specify configuration under a single variable.
@@ -140,7 +140,7 @@ func main() {
 	logsv1.AddFlags(logOptions, pflag.CommandLine)
 	globalOptions.AddFlags(pflag.CommandLine)
 	runtimeWebhookServerOpts.AddFlags(pflag.CommandLine)
-	genericLifecycleHandlers.AddFlags(pflag.CommandLine)
+	lifecycleHandlers.AddFlags(pflag.CommandLine)
 	awsMetaHandlers.AddFlags(pflag.CommandLine)
 	dockerMetaHandlers.AddFlags(pflag.CommandLine)
 	nutanixMetaHandlers.AddFlags(pflag.CommandLine)
@@ -175,7 +175,7 @@ func main() {
 	}
 
 	var allHandlers []handlers.Named
-	allHandlers = append(allHandlers, genericLifecycleHandlers.AllHandlers(mgr)...)
+	allHandlers = append(allHandlers, lifecycleHandlers.AllHandlers(mgr)...)
 	allHandlers = append(allHandlers, awsMetaHandlers.AllHandlers(mgr)...)
 	allHandlers = append(allHandlers, dockerMetaHandlers.AllHandlers(mgr)...)
 	allHandlers = append(allHandlers, nutanixMetaHandlers.AllHandlers(mgr)...)