Feat : Bulk insert

[elrhomariyounes]

What kind of change does this PR introduce?

Feature bulk insert

What is the current behavior?

Feature request #13

What is the new behavior?

• Overload the insert method to perform a bulk insert on a table
• PrepareRequestData return object instead of Dictionary<string,string>
• Helpers.MakeRequest method expect data as object instead of Dictionary<string,string>

Additional context

• This changes didn't break anything , tests passed perfectly!

Usage

var client = Client.Instance.Initialize(baseUrl, new ClientAuthorization(AuthorizationType.Open, null));
var rocketUser = new User
            {
                Username = "rocket",
                AgeRange = new Range(35, 40),
                Status = "ONLINE"
            };

var aceUser = new User
            {
                Username = "ace",
                AgeRange = new Range(21, 28),
                Status = "OFFLINE"
            };
var users = new List<User>
            {
               rocketUser,
               aceUser
            };

var response = await client.Table<User>().Insert(users);

[acupofjose]

LOVE this! Thanks @elrhomariyounes!