improve gyaml with gopkg.in/yaml.v3; update unit test cases for gfile/gyaml/gtime/garray

.example/encoding/gyaml/gyaml.go

@@ -0,0 +1,30 @@
+package main
+
+import (
+	"fmt"
+
+	"github.com/gogf/gf/encoding/gyaml"
+)
+
+func main() {
+	var yamlStr string = `
+#即表示url属性值；
+url: http://www.wolfcode.cn 
+#即表示server.host属性的值；
+server:
+    host: http://www.wolfcode.cn 
+#数组，即表示server为[a,b,c]
+server:
+    - 120.168.117.21
+    - 120.168.117.22
+    - 120.168.117.23
+#常量
+pi: 3.14   #定义一个数值3.14
+hasChild: true  #定义一个boolean值
+name: '你好YAML'   #定义一个字符串
+`
+
+	i, err := gyaml.Decode([]byte(yamlStr))
+	fmt.Println(err)
+	fmt.Println(i)
+}