SomniaGuestLog - Address search/query using Nominatim - Initial implementation

Initial implementation for address search/query using external APIs (OSM Nominatim) & Added required classes for supporting more APIs in the future.

src/Somnia.GuestLog/Services/AddressQuery/ConfigFileAddressQueryFactory.cs

@@ -0,0 +1,27 @@
+using Microsoft.Extensions.Options;
+using Somnia.GuestLog.Models.Configuration;
+using Somnia.GuestLog.Utils.DI;
+
+namespace Somnia.GuestLog.Services.AddressQuery;
+
+public class ConfigFileAddressQueryFactory(
+    IServiceProvider serviceProvider,
+    IOptions<AddressQueryConfig> config
+) : IAddressQueryFactory, IFactoryDI
+{
+    public static void RegisterFactoryItems(IServiceCollection services)
+    {
+        services.AddKeyedTransient<IAddressQueryService, NominatimAddressQueryService>(AddressQueryConfig.AddressQueryProviderEnum.Nominatim);
+    }
+
+    public IAddressQueryService GetService()
+    {
+        if (config.Value.EnableAddressQuery == false)
+        {
+            throw new InvalidOperationException("AddressQuery is disabled. Enable and configure it first!");
+        }
+
+        return serviceProvider.GetKeyedService<IAddressQueryService>(config.Value.Provider)
+            ?? throw new InvalidOperationException($"AddressQueryService not found for provider: '{config.Value.Provider}'");
+    }
+}