Implemented Drift connection & database (#176)

Closes #170

lib/src/core/database/app_database.dart

@@ -0,0 +1,15 @@
+import 'package:drift/drift.dart';
+import 'package:sizzle_starter/src/core/database/connection/open_connection_stub.dart'
+    if (dart.library.io) 'package:sizzle_starter/src/core/database/connection/open_connection_io.dart'
+    if (dart.library.html) 'package:sizzle_starter/src/core/database/connection/open_connection_html.dart'
+    as connection;
+
+part 'app_database.g.dart';
+
+@DriftDatabase()
+class AppDatabase extends _$AppDatabase {
+  AppDatabase({required String name}) : super(connection.openConnection(name));
+
+  @override
+  int get schemaVersion => 1;
+}

lib/src/core/database/connection/open_connection_html.dart

@@ -0,0 +1,6 @@
+import 'package:drift/drift.dart';
+import 'package:drift/web.dart';
+
+QueryExecutor openConnection(String name) => WebDatabase(
+      name,
+    );

lib/src/core/database/connection/open_connection_io.dart

@@ -0,0 +1,15 @@
+import 'dart:io';
+
+import 'package:drift/drift.dart';
+import 'package:drift/native.dart';
+import 'package:path/path.dart' as path;
+import 'package:path_provider/path_provider.dart';
+
+QueryExecutor openConnection(String name) => LazyDatabase(
+      () async {
+        final dbFolder = await getApplicationDocumentsDirectory();
+        final file = File(path.join(dbFolder.path, '$name.sqlite'));
+
+        return NativeDatabase(file);
+      },
+    );

lib/src/core/database/connection/open_connection_stub.dart

@@ -0,0 +1,4 @@
+import 'package:drift/drift.dart';
+
+QueryExecutor openConnection(String name) =>
+    throw UnsupportedError('Platform is not recognised as supported one');