feat(socket-proxy): implement Docker socket proxy and related configurations

- Updated Dockerfile and Makefile for socket-proxy build.
- Modified go.mod to include necessary dependencies.
- Updated CI workflows for socket-proxy integration.
- Better module isolation
- Code refactor

internal/utils/strutils/split_join_test.go

@@ -4,8 +4,8 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/stretchr/testify/require"
 	. "github.com/yusing/go-proxy/internal/utils/strutils"
-	. "github.com/yusing/go-proxy/internal/utils/testing"
 )
 
 var alphaNumeric = func() string {
@@ -31,8 +31,8 @@ func TestSplit(t *testing.T) {
 	for sep, rsep := range tests {
 		t.Run(sep, func(t *testing.T) {
 			expected := strings.Split(alphaNumeric, sep)
-			ExpectEqual(t, SplitRune(alphaNumeric, rsep), expected)
-			ExpectEqual(t, JoinRune(expected, rsep), alphaNumeric)
+			require.Equal(t, expected, SplitRune(alphaNumeric, rsep))
+			require.Equal(t, alphaNumeric, JoinRune(expected, rsep))
 		})
 	}
 }