feat(repository): add ability to compare Identity objects (#56)

Add naive objects comparison based on repository path. Use with caution,
previously loaded into memory index, odb, etc. might be different.

lib/src/repository.dart

@@ -1,8 +1,8 @@
 import 'dart:ffi';
 
+import 'package:equatable/equatable.dart';
 import 'package:ffi/ffi.dart';
 import 'package:libgit2dart/libgit2dart.dart';
-
 import 'package:libgit2dart/src/bindings/attr.dart' as attr_bindings;
 import 'package:libgit2dart/src/bindings/describe.dart' as describe_bindings;
 import 'package:libgit2dart/src/bindings/graph.dart' as graph_bindings;
@@ -12,8 +12,10 @@ import 'package:libgit2dart/src/bindings/repository.dart' as bindings;
 import 'package:libgit2dart/src/bindings/reset.dart' as reset_bindings;
 import 'package:libgit2dart/src/bindings/status.dart' as status_bindings;
 import 'package:libgit2dart/src/util.dart';
+import 'package:meta/meta.dart';
 
-class Repository {
+@immutable
+class Repository extends Equatable {
   /// Initializes a new instance of the [Repository] class from provided
   /// pointer to repository object in memory.
   ///
@@ -741,6 +743,9 @@ class Repository {
 
     return packbuilder.writtenLength;
   }
+
+  @override
+  List<Object?> get props => [path];
 }
 
 // coverage:ignore-start
@@ -821,10 +826,14 @@ class RepositoryCallback {
   final String? originUrl;
 }
 
-class Identity {
+@immutable
+class Identity extends Equatable {
   /// Identity to use for reflogs.
   const Identity({required this.name, required this.email});
 
   final String name;
   final String email;
+
+  @override
+  List<Object?> get props => [name, email];
 }

test/repository_empty_test.dart

@@ -85,6 +85,7 @@ void main() {
         final identity = repo.identity;
         expect(identity.name, 'name');
         expect(identity.email, 'email@email.com');
+        expect(identity, equals(repo.identity));
       });
 
       test('unsets identity', () {

test/repository_test.dart

@@ -249,5 +249,9 @@ void main() {
     test('returns string representation of Repository object', () {
       expect(repo.toString(), contains('Repository{'));
     });
+
+    test('supports value comparison', () {
+      expect(repo, equals(Repository.open(tmpDir.path)));
+    });
   });
 }