Clean up - Remove duplicate dhcp package (#397)

## Description


Remove duplicate dhcp package. This was left over from the initial incorporation. The functionality still exists, it has just been moved under the internal package.

## Why is this needed



Fixes: #

## How Has This Been Tested?





## How are existing users impacted? What migration steps/scripts do we need?





## Checklist:

I have:

- [ ] updated the documentation and/or roadmap (if required)
- [ ] added unit or e2e tests
- [ ] provided instructions on how to upgrade

backend/file/file.go

@@ -15,7 +15,7 @@ import (
 	"github.com/fsnotify/fsnotify"
 	"github.com/ghodss/yaml"
 	"github.com/go-logr/logr"
-	"github.com/tinkerbell/smee/dhcp/data"
+	"github.com/tinkerbell/smee/internal/dhcp/data"
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/codes"
 )

backend/file/file_test.go

@@ -19,7 +19,7 @@ import (
 	"github.com/go-logr/stdr"
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
-	"github.com/tinkerbell/smee/dhcp/data"
+	"github.com/tinkerbell/smee/internal/dhcp/data"
 )
 
 func TestNewWatcher(t *testing.T) {

backend/kube/kube.go

@@ -9,7 +9,7 @@ import (
 	"net/netip"
 	"net/url"
 
-	"github.com/tinkerbell/smee/dhcp/data"
+	"github.com/tinkerbell/smee/internal/dhcp/data"
 	"github.com/tinkerbell/tink/api/v1alpha1"
 	"go.opentelemetry.io/otel"
 	"go.opentelemetry.io/otel/codes"

backend/kube/kube_test.go

@@ -10,7 +10,7 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
-	"github.com/tinkerbell/smee/dhcp/data"
+	"github.com/tinkerbell/smee/internal/dhcp/data"
 	"github.com/tinkerbell/tink/api/v1alpha1"
 	"k8s.io/apimachinery/pkg/api/meta"
 	v1 "k8s.io/apimachinery/pkg/apis/meta/v1"

backend/noop/noop.go

@@ -6,7 +6,7 @@ import (
 	"errors"
 	"net"
 
-	"github.com/tinkerbell/smee/dhcp/data"
+	"github.com/tinkerbell/smee/internal/dhcp/data"
 )
 
 // Handler is a noop backend.