feat: add source param to web avatar creator (#186)

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## [SDK-677](https://ready-player-me.atlassian.net/browse/SDK-677)

## Description

-   Add source parameter to the URLs

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## How to Test

- Check, that the event is sent to amplitude with the given source, when
opening the avatar creator

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## Checklist

-   [ ] Tests written or updated for the changes.
-   [ ] Documentation is updated.
-   [ ] Changelog is updated.

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[SDK-677]:
https://ready-player-me.atlassian.net/browse/SDK-677?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ

Runtime/WebView/Data/UrlConfig.cs

@@ -13,6 +13,7 @@ public class UrlConfig
         private const string TAG = nameof(UrlConfig);
         private const string CLEAR_CACHE_PARAM = "clearCache";
         private const string FRAME_API_PARAM = "frameApi";
+        private const string SOURCE_PARAM = "source";
         private const string QUICK_START_PARAM = "quickStart";
         private const string SELECT_BODY_PARAM = "selectBodyType";
         private const string LOGIN_TOKEN_PARAM = "token";
@@ -41,6 +42,13 @@ public string BuildUrl(string loginToken = "")
             var builder = new StringBuilder($"https://{CoreSettingsHandler.CoreSettings.Subdomain}.readyplayer.me/");
             builder.Append(language != Language.Default ? $"{language.GetValue()}/" : string.Empty);
             builder.Append($"avatar?{FRAME_API_PARAM}");
+            #if UNITY_ANDROID
+                builder.Append($"&{SOURCE_PARAM}=unity-android-avatar-creator");
+            #elif UNITY_IOS
+                builder.Append($"&{SOURCE_PARAM}=unity-ios-avatar-creator");
+            #else
+            builder.Append($"&{SOURCE_PARAM}=unity-avatar-creator");
+            #endif
             builder.Append(clearCache ? $"&{CLEAR_CACHE_PARAM}" : string.Empty);
             if (loginToken != string.Empty)
             {

Tests/Editor/UrlConfigTests.cs

@@ -7,20 +7,20 @@ namespace ReadyPlayerMe.Core.Tests
     public class UrlConfigTests : MonoBehaviour
     {
         private static readonly string URL_BASE = $"https://{CoreSettingsHandler.CoreSettings.Subdomain}.readyplayer.me";
-        private readonly string URL_DEFAULT = $"{URL_BASE}/avatar?frameApi&selectBodyType";
-        private readonly string URL_LANG_GERMAN = $"{URL_BASE}/de/avatar?frameApi&selectBodyType";
-        private readonly string URL_LANG_BRAZIL = $"{URL_BASE}/pt-BR/avatar?frameApi&selectBodyType";
+        private readonly string URL_DEFAULT = $"{URL_BASE}/avatar?frameApi&source=unity-avatar-creator&selectBodyType";
+        private readonly string URL_LANG_GERMAN = $"{URL_BASE}/de/avatar?frameApi&source=unity-avatar-creator&selectBodyType";
+        private readonly string URL_LANG_BRAZIL = $"{URL_BASE}/pt-BR/avatar?frameApi&source=unity-avatar-creator&selectBodyType";
 
-        private readonly string URL_GENDER_MALE = $"{URL_BASE}/avatar?frameApi&gender=male&selectBodyType";
-        private readonly string URL_GENDER_NONE = $"{URL_BASE}/avatar?frameApi&gender=male&selectBodyType";
+        private readonly string URL_GENDER_MALE = $"{URL_BASE}/avatar?frameApi&source=unity-avatar-creator&gender=male&selectBodyType";
+        private readonly string URL_GENDER_NONE = $"{URL_BASE}/avatar?frameApi&source=unity-avatar-creator&gender=male&selectBodyType";
 
-        private readonly string URL_TYPE_FULLBODY = $"{URL_BASE}/avatar?frameApi&bodyType=fullbody";
-        private readonly string URL_TYPE_HALFBODY = $"{URL_BASE}/avatar?frameApi&bodyType=halfbody";
+        private readonly string URL_TYPE_FULLBODY = $"{URL_BASE}/avatar?frameApi&source=unity-avatar-creator&bodyType=fullbody";
+        private readonly string URL_TYPE_HALFBODY = $"{URL_BASE}/avatar?frameApi&source=unity-avatar-creator&bodyType=halfbody";
 
-        private readonly string URL_CLEAR_CACHE = $"{URL_BASE}/avatar?frameApi&clearCache&selectBodyType";
+        private readonly string URL_CLEAR_CACHE = $"{URL_BASE}/avatar?frameApi&source=unity-avatar-creator&clearCache&selectBodyType";
 
-        private readonly string URL_QUICK_START = $"{URL_BASE}/avatar?frameApi&quickStart";
-        private readonly string URL_TOKEN = $"{URL_BASE}/avatar?frameApi&token=TOKEN&selectBodyType";
+        private readonly string URL_QUICK_START = $"{URL_BASE}/avatar?frameApi&source=unity-avatar-creator&quickStart";
+        private readonly string URL_TOKEN = $"{URL_BASE}/avatar?frameApi&source=unity-avatar-creator&token=TOKEN&selectBodyType";
         private const string LOGIN_TOKEN = "TOKEN";
 
         public UrlConfig config;