feat: Add Extra Methods

[cjmellor]

Description

This pull request includes updates to the README.md documentation, new methods in the HasAchievements concern, and adjustments to the test cases to reflect these changes. The most important changes include the addition of new methods for retrieving user achievements and specific progress, as well as the corresponding updates in the documentation and test cases.

Documentation Updates:

• Moved the "Revoke Achievement" section to a new location in README.md for better organization. [1] [2]
• Updated method calls in README.md to reflect new method names for retrieving achievements and specific progress.

New Methods in HasAchievements Concern:

• Added getUserAchievements method to retrieve all achievements of a user.
• Added achievementsWithSpecificProgress method to retrieve achievements with a specific progress value.

Test Case Adjustments:

• Updated test cases to use the new getUserAchievements method instead of directly accessing the achievements property. [1] [2] [3] [4] [5] [6]

Type of Change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Related Issues and Pull Requests

• Issue #...
• PR #...

Testing

Please provide a passing test where possible. This package uses PestPHP

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• I have made corresponding changes to the documentation [OPTIONAL]