Introduce object creation interface with initial values

[highcloud100]

What this PR does / why we need it:

There was no way to set nested object in one set operation.
So It needed multiple set operation.

To resolve this issues, this pr modify the set operation to create a nested object in one operation.

More details refer the follow link.
yorkie-team/yorkie-js-sdk#691 (comment)

Which issue(s) this PR fixes:

Fixes #663

Does this PR introduce a user-facing change?:

1. Now users can set object with json in one operation.

As-is

• multiple set operation

err = d1.Update(func(root *json.Object, p *presence.Presence) error {
	  root.SetNewObject("obj").SetString("str", "v")
	  root.GetObject("obj").SetNewArray("arr").AddInteger(1).AddString("str")
	  root.GetObject("obj").SetNewObject("obj").SetDouble("key3", 42.2)
	  root.GetObject("obj").SetNewCounter("cnt", crdt.LongCnt, 0)
	  root.GetObject("obj").SetNewText("txt")
	  root.GetObject("obj").SetNewTree("tree", &json.TreeNode{
		  Type: "doc",
		  Children: []json.TreeNode{{
			  Type: "p", Children: []json.TreeNode{{Type: "text", Value: "ab"}},
		  }},
	  })
	  return nil
})

To-be

• single set operation

err := d1.Update(func(root *json.Object, p *presence.Presence) error {
	root.SetNewObject("obj", map[string]interface{}{ // 1: object
		"str": "v",                                  // 1: string
		"arr": []interface{}{1, "str"},              // 3: array, 1, "str"
		"obj": map[string]interface{}{"key3": 42.2}, // 2: object, 42.2
		"cnt": json.NewCounter(0, crdt.LongCnt),     // 1: counter
		"txt": json.NewText(),                       // 1: text
		"tree": json.NewTree(&json.TreeNode{   // 1: tree
			Type: "doc",
			Children: []json.TreeNode{{
				Type: "p", Children: []json.TreeNode{{Type: "text", Value: "ab"}},
			}},
		}),
	})
	return nil
})

2. Now user can set array with value in one operation.

As-is

root.SetNewArray("k1").AddString("1", "2", "3")

To be

root.SetNewArray("k1", []interface{}{"1", "2", "3"})

Limitations

1. Current users can only set the array initial value to []interface{} without any specific type, this problem also occurs when set an object with the json literal.

root.SetNewArray("k1", []interface{}{"1", "2", "3"})
root.SetNewArray("k1", []int{"1", "2", "3"}) // does not support now

refer the implementation of "encoding/json"

2. There is no way to set Text with initial value.

err := d1.Update(func(root *json.Object, p *presence.Presence) error {
	root.SetNewObject("obj", map[string]interface{}{
                "txt": json.NewText(), 
		"txt": json.NewText("initial text"),  // does not support now                  
	})
	return nil
})

Checklist:

• Added relevant tests or not required
• Didn't break anything

[codecov]

Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (145d4f8) 49.35% compared to head (cee9b6d) 50.14%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
pkg/document/crdt/array.go	20.00%	3 Missing and 1 partial ⚠️
pkg/document/crdt/object.go	20.00%	3 Missing and 1 partial ⚠️
pkg/document/crdt/root.go	86.66%	3 Missing and 1 partial ⚠️
pkg/document/crdt/counter.go	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #756      +/-   ##
==========================================
+ Coverage   49.35%   50.14%   +0.79%     
==========================================
  Files          69       69              
  Lines       10113    10182      +69     
==========================================
+ Hits         4991     5106     +115     
+ Misses       4606     4534      -72     
- Partials      516      542      +26     

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[chacha912]

Thanks for your contribution!
I've left some comments, please check them.

[hackerwins]

LGTM. 👍