Slight refactor to clean up resource loading from plugins

PkmnLib.Tests/Dataloader/SpeciesDataloaderTests.cs

@@ -1,4 +1,5 @@
 using PkmnLib.Dynamic.Libraries.DataLoaders;
+using PkmnLib.Dynamic.ScriptHandling.Registry;
 using PkmnLib.Static.Libraries;
 
 namespace PkmnLib.Tests.Dataloader;
@@ -8,7 +9,9 @@ public class SpeciesDataloaderTests
     [Test]
     public async Task TestPrimarySpeciesFile()
     {
-        await using var file = File.Open("Data/Pokemon.json", FileMode.Open, FileAccess.Read, FileShare.Read);
+        IResourceProvider plugin = new Plugin.Gen7.Gen7Plugin();
+        var result = plugin.GetResource(ResourceFileType.Species)!;
+        await using var file = result.Open();
         var typeLibrary = new TypeLibrary();
         typeLibrary.RegisterType("Normal");
         typeLibrary.RegisterType("Fire");