The "builder" API

## Description

(Idea by @eamonnmcmanus )

We want to build a JsonObject/Array in a simple way like:

```java
Map user = Map.of(
"id", 1001,
"name", "Alice",
"age", 25,
"tags", List.of("Java", "Kotlin", "Scala"),
"address", Map.of("city", "Shanghai", "street", "Xujiahui")
);

JsonObject userJson = JsonObject.parse(user);
```

However, because of Java's type system, we can only do:
```java
// JsonObject.class
static JsonObject parse(Map)
static JsonObject of(Map)

// JsonArray.class
static JsonArray parse(Iterable)
static JsonArray of(Iterable)

// JsonPrimitive
static JsonPrimitive parse(Object) // ???

// JsonElelement
static JsonElement parse(Object)
```