[client, management] Add port forwarding (#3275)

Add initial support to ingress ports on the client code.

- new types where added
- new protocol messages and controller

management/server/util/util_test.go

@@ -0,0 +1,41 @@
+package util
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+type testObject struct {
+	value int
+}
+
+func (t testObject) Equal(other testObject) bool {
+	return t.value == other.value
+}
+
+func Test_MergeUniqueArraysWithoutDuplicates(t *testing.T) {
+	arr1 := []testObject{{value: 1}, {value: 2}}
+	arr2 := []testObject{{value: 2}, {value: 3}}
+	result := MergeUnique(arr1, arr2)
+	assert.Len(t, result, 3)
+	assert.Contains(t, result, testObject{value: 1})
+	assert.Contains(t, result, testObject{value: 2})
+	assert.Contains(t, result, testObject{value: 3})
+}
+
+func Test_MergeUniqueHandlesEmptyArrays(t *testing.T) {
+	arr1 := []testObject{}
+	arr2 := []testObject{}
+	result := MergeUnique(arr1, arr2)
+	assert.Empty(t, result)
+}
+
+func Test_MergeUniqueHandlesOneEmptyArray(t *testing.T) {
+	arr1 := []testObject{{value: 1}, {value: 2}}
+	arr2 := []testObject{}
+	result := MergeUnique(arr1, arr2)
+	assert.Len(t, result, 2)
+	assert.Contains(t, result, testObject{value: 1})
+	assert.Contains(t, result, testObject{value: 2})
+}