Feature: Implement HTTP Accept request header to be randomized with probability

[dawid-czarnecki]

Description

Implement different probabilities for different values of HTTP Accept header.

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

• Cererate local VM

Test Configuration:

• CakePHP version: 4.4.9
• Application name: Cerebrate
• Application version: 1.14

Checklist:

• PR title contains the nature of changes (Docs, Feature, Fix, CI, etc.)
• I've set corresponding reviewers, set assignees, and labels.
• My code follows the style guidelines of this project (running pre-commit)
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• 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
• Any dependent changes have been merged and published in downstream modules