feat(reference): add ability to create direct reference

test/reflog_test.dart

@@ -0,0 +1,56 @@
+import 'dart:io';
+
+import 'package:test/test.dart';
+import 'package:libgit2dart/src/repository.dart';
+import 'package:libgit2dart/src/reflog.dart';
+
+import 'helpers/util.dart';
+
+void main() {
+  group('RefLog', () {
+    late final Repository repo;
+    late final RefLog reflog;
+    final tmpDir = '${Directory.systemTemp.path}/reflog_testrepo/';
+
+    setUpAll(() async {
+      if (await Directory(tmpDir).exists()) {
+        await Directory(tmpDir).delete(recursive: true);
+      }
+      await copyRepo(
+        from: Directory('test/assets/testrepo/'),
+        to: await Directory(tmpDir).create(),
+      );
+      repo = Repository.open(tmpDir);
+      reflog = RefLog(repo.head);
+    });
+
+    tearDownAll(() async {
+      repo.head.free();
+      reflog.free();
+      repo.close();
+      await Directory(tmpDir).delete(recursive: true);
+    });
+
+    test('initializes successfully', () {
+      expect(reflog, isA<RefLog>());
+    });
+
+    test('returns correct number of log entries', () {
+      expect(reflog.count, 3);
+    });
+
+    test('returns the log message', () {
+      final entry = reflog.entryAt(0);
+      expect(
+        entry.message,
+        "merge feature: Merge made by the 'recursive' strategy.",
+      );
+    });
+
+    test('returns the committer of the entry', () {
+      final entry = reflog.entryAt(0);
+      expect(entry.committer['name'], 'Aleksey Kulikov');
+      expect(entry.committer['email'], 'skinny.mind@gmail.com');
+    });
+  });
+}