Adds Configuration Manager + tests

Core/Configurations/ConfigurationManager/KeyValueConfigurationBuilder.cs

@@ -0,0 +1,56 @@
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+using Microsoft.Extensions.Configuration;
+
+namespace Configuration.Core;
+    public class KeyValueConfigurationBuilder
+{
+    private readonly IConfigurationRepository _repository;
+    private readonly JObject _rootObject = new();
+    private ConfigurationReloadToken _reloadToken = new();
+    private IConfiguration _configuration;
+
+    public KeyValueConfigurationBuilder(IConfigurationRepository repository)
+    {
+        _repository = repository;
+    }
+
+    public async Task LoadConfiguration()
+    {
+        var configurations = await _repository.GetActiveConfigurations();
+        foreach (var config in configurations)
+        {
+            AddKeyValue(config.Key, config.Value);
+        }
+        OnReload();
+    }
+
+    public void AddKeyValue(string key, string jsonValue)
+    {
+        var valueObject = JsonConvert.DeserializeObject<JObject>(jsonValue);
+        var parts = key.Split(':');
+
+        JObject current = _rootObject;
+        for (int i = 0; i < parts.Length - 1; i++)
+        {
+            var part = parts[i];
+            if (!current.ContainsKey(part))
+            {
+                current[part] = new JObject();
+            }
+            current = (JObject)current[part];
+        }
+
+        current[parts[^1]] = valueObject;
+    }
+
+    private void OnReload()
+    {
+        var previousToken = Interlocked.Exchange(ref _reloadToken, new ConfigurationReloadToken());
+        previousToken.OnReload();
+        _configuration = null;
+    }
+
+    public IConfiguration Build() =>
+        _configuration ??= new JsonConfiguration(_rootObject, _reloadToken);
+}