General

• 🆕 Added AutoTabsScaffold
• 🎉 Added an example of using cubit with base status state
• 🤔 Added loading indicator as a separate reusable widget
• 🔨 Added build.yaml to define freezed and JSON serializable generation, so builders don't need to look everywhere, also it will restrict developers from making DTOs anywhere else.
• ♻️ response_errors are moved to it's folder now, previously it was under service

⚠️

• PR is getting big, so will make some basic UI widgets in a separate PR

Checklists

• Platform-specific changes (input, image picking, etc) are tested on both of the platforms (Android and iOS)
• It is tested that the UI changes are rendered correctly on different device sizes (such as long lists or expanded rows) with safe area conditions.
• Edge cases, such as responses being empty or invalid, missing data, no internet connection, etc, are tested and the app works as expected.

Showcase

• Either showcase screenshots/videos are attached, or this PR does not require such a showcase.