Refactoring in Countly.cs

[AliRKat]

To reduce the number of warnings and increase the code readability, I did some refactoring Refactoring contains:

• Regrouping fields in order
• Switching from deprecated configuration fields to setter/getter methods (which reduces the number of warnings printed)
• Logs in InitInternal method updated
• SDK limit default fields put in a region

2 things need to be noted: 1- We can move this section:

if (configuration.GetServerUrl()[configuration.GetServerUrl().Length - 1] == '/') {
                configuration.ServerUrl = configuration.GetServerUrl().Remove(configuration.GetServerUrl().Length - 1);
            }

Into configuration. I believe there is no need to do it here. Since we also don't have a setter method for the server URL, this currently can't be refactored in this structure.

2- We moved away from initializing with prefab a long time ago. I planned to do that clean-up here, too, but it requires touching old configuration tests. We can move forward depending on you guys' decision.

[AliRKat]

[Unity] Refactoring in Countly.cs