[FSSDK-10777] SSR improvements + RSC support addition

[junaed-optimizely]

Summary

• Server-side bundle: Added a new server.ts entry point that can be safely imported in React Server Components (RSC) without client-only React APIs (createContext, hooks, etc.)
• ODP Qualified Segments support: Added ability to pass qualifiedSegments through the OptimizelyProvider and setUser, allowing pre-fetched segments to be set synchronously before the SDK is ready — critical for SSR where async ODP fetches aren't viable
• getQualifiedSegments utility: A standalone async function that parses the datafile for ODP config, extracts segment audience conditions, and queries the ODP GraphQL API — designed for use in server-side data fetching
• Hook readiness logic: Improved useExperiment, useFeature, and useDecision hooks to check for both config and user context availability (including segments) before computing decisions, enabling correct SSR rendering without waiting for onReady
• Refactored utils: Migrated utils.tsx → utils.ts (removing React dependency) so utilities can be shared between client and server entry points
• Documentation: Added a comprehensive integration guide covering SSR, SSG, and App Router patterns
• Build updates: Updated build config to produce the new server bundle

Test plan

Tests have been added to support new changes

Issues

• FSSDK-10777

[raju-opti]

few comments

[raju-opti]

looks good. Few comments

[raju-opti]

Looks good. couple of small comments