chore: optimize string search with Aho–Corasick algorithm (#1476)

* chore: optimize string search with Aho–Corasick algorithm

* chore: optimize keywords replacer

* fix: replacer bugs

* chore: reorder members

core/stringx/replacer_fuzz_test.go

@@ -0,0 +1,42 @@
+//go:build go1.18
+// +build go1.18
+
+package stringx
+
+import (
+	"fmt"
+	"math/rand"
+	"strings"
+	"testing"
+)
+
+func FuzzReplacerReplace(f *testing.F) {
+	keywords := make(map[string]string)
+	for i := 0; i < 20; i++ {
+		keywords[Randn(rand.Intn(10)+5)] = Randn(rand.Intn(5) + 1)
+	}
+	rep := NewReplacer(keywords)
+	printableKeywords := func() string {
+		var buf strings.Builder
+		for k, v := range keywords {
+			fmt.Fprintf(&buf, "%q: %q,\n", k, v)
+		}
+		return buf.String()
+	}
+
+	f.Add(50)
+	f.Fuzz(func(t *testing.T, n int) {
+		text := Randn(rand.Intn(n%50+50) + 1)
+		defer func() {
+			if r := recover(); r != nil {
+				t.Errorf("mapping: %s\ntext: %s", printableKeywords(), text)
+			}
+		}()
+		val := rep.Replace(text)
+		keys := rep.(*replacer).node.find([]rune(val))
+		if len(keys) > 0 {
+			t.Errorf("mapping: %s\ntext: %s\nresult: %s\nmatch: %v",
+				printableKeywords(), text, val, keys)
+		}
+	})
+}