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[AI-FSSDK] [FSSDK-12337] Add Feature Rollout support (#1140)

## Summary

Adds Feature Rollout support to the JavaScript SDK. Feature Rollouts are a new experiment rule type that combines Targeted Delivery simplicity with A/B test measurement capabilities. During project config parsing, the "everyone else" variation from the flag's rollout is injected into any experiment with type "feature_rollout", enabling correct evaluation without changes to decision logic.

## Changes

- Added optional `type` string field to the Experiment interface
- Added config parsing logic to inject the "everyone else" rollout variation into feature_rollout experiments
- Added traffic allocation entry (endOfRange=10000) for the injected variation
- Added `getEveryoneElseVariation` helper function to extract the last rollout rule's first variation
- Updated variation lookup maps (variationKeyMap, variationIdMap, variationVariableUsageMap) with injected variation
- Added 6 unit tests covering feature rollout injection, edge cases, and backward compatibility

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Co-authored-by: Raju Ahmed <raju.ahmed@optimizely.com>

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