Implement Advanced Feature Rollout Strategies

[oasaph]

Description

Add support for sophisticated rollout strategies including percentage-based rollouts, user targeting, and A/B testing capabilities.

Goals

• Percentage-based rollouts
• User targeting/segmentation
• A/B testing support
• Gradual rollout automation

Proposed Features

1. Percentage rollouts
2. User attribute targeting
3. A/B test configuration
4. Rollout scheduling
5. Rollback capabilities

Example Interface

flag = Flag(
    name="new_ui",
    rollout_strategy=PercentageRollout(
        percentage=25,
        user_attribute="user_id",
        segments=["premium", "beta"]
    )
)

if flag.is_enabled(user=current_user):
    show_new_ui()

Acceptance Criteria

• Percentage rollout implementation
• User targeting system
• A/B testing framework
• Documentation and examples