Auth matrix refactoring

[StanevPrime]

Overview

Closes: #740

Auth matrix refactoring with the aim to achieve the following goals

• Improved error handling
• Reduced time for implementing new authentication methods
• Reduced time for implementing a request and response payload
• BE auth methods dynamic configuration
• Stream-based clear and concise Flutter API
• Library decoupled, observer-based side effects
• Applied SOLID principles

Checklist

Implementation

• [x] Implementation matches ticket acceptance criteria and technical notes
• [x] Manually tested against Acceptance Criteria
• [x] UI checked in Light / Dark mode

Stability

• [x] Checked if changes affect any features and verified affected features work as expected
• [x] Added unit tests for new code and verified existing tests work as expected

Code quality

• [x] Updated CHANGELOG.md, README.md and package versions in pubspec.yaml
• [x] Dependencies are updated to latest versions or new tickets are created if there are breaking changes or deprecations
• [x] If an unrelated part of the codebase needs to be updated or refactored, create tickets with proposed changes

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 92.18%. Comparing base (6739d47) to head (d00d522).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## develop #754 +/- ## =========================================== - Coverage 94.17% 92.18% -1.99% =========================================== Files 59 29 -30 Lines 1201 499 -702 =========================================== - Hits 1131 460 -671 + Misses 70 39 -31 ```

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[GoranPrime]

I've found 1 error and 2 hints upon a fresh project generation with the new auth_matrix module enabled.

1. /lib_router/router.dart should have this import added to it:

import '../feature_auth_matrix/di/auth_matrix_page_with_dependencies.dart';

2. The triple-slash documentation comments in the mentioned files should be replaced with just two slashes (or the library keyword added)

[StanevPrime]

1. router.dart

The error should be fixed. Please retest.