Errors while running flutter analyze

**Describe the bug**
There are many errors while running flutter analyze command. There are issues of linting, naming etc.

**To Reproduce**
Run flutter analyze . in terminal

**Expected behavior**
The code should be error-free

**Demonstration**

**Environment**
- Flutter version: 2.8.1

**Additional context**
The errors will need to be sorted for proper code according to the rules of linting.

Run `flutter analyze .` in the repository using the reported Flutter 2.8.1 environment and review the diagnostics shown in the issue. No files or tests are named, so first identify which reported linting and naming findings are in scope; done means the analyzer reports no errors.

Written by the indexing model from the issue text.