Adds Configuration Manager + tests

Core/Configurations/ConfigurationManager/ConfigurationRepository.cs

@@ -0,0 +1,24 @@
+using System.Data;
+using Insight.Database;
+
+namespace Configuration.Core;
+    public class ConfigurationRepository : IConfigurationRepository
+{
+    private readonly IDbConnection _connection;
+
+    public ConfigurationRepository(IDbConnection connection)
+    {
+        _connection = connection;
+    }
+
+    public async Task<IEnumerable<AppConfiguration>> GetActiveConfigurations()
+    {
+        const string sql = @"
+            SELECT id, key, value, label, content_type, valid_from, expires_at, created_at, modified_at, etag 
+            FROM prod.app_configuration 
+            WHERE (expires_at IS NULL OR expires_at > CURRENT_TIMESTAMP)
+            AND (valid_from IS NULL OR valid_from <= CURRENT_TIMESTAMP)";
+
+        return await _connection.QueryAsync<AppConfiguration>(sql);
+    }
+}