Add `RandomOrder` interceptor

[roxblnfk]

Run tests in random order to detect hidden dependencies between tests.

Behavior

• Shuffle test methods within TestCase
• Shuffle TestCases within TestSuite

Configuration

new RandomOrder(
    seed: 12345,         // optional, random by default
    shuffleTests: true,  // shuffle Tests within TestCase
    shuffleCases: true,  // shuffle TestCases within Suite
),

Output

Print seed value so user can reproduce the order on failure.