feat: add external view functions for liquidity providers and user positions

[SynnekOG]

Pull Request

Summary

This PR enhances LiquidityManagerV2 with new external view functions, allowing retrieval of liquidity provider details and user positions. These additions improve transparency and make it easier for frontends and integrators to query contract state.

Changes

• LiquidityManagerV2
  • Added getLiquidityProvider(poolId, provider):
    • Returns detailed LiquidityProvider data for a given pool and address.
    • Includes Natspec documentation.
  • Added getUserPositions(user):
    • Returns an array of LiquidityPosition structs associated with a given user.
    • Includes Natspec documentation.
• Ran forge fmt to ensure consistent formatting.

Motivation

• Enables external consumers (dApps, dashboards, indexers) to query pool participation and liquidity provider details directly on-chain.
• Lays groundwork for user-facing analytics and portfolio tracking.
• Provides read-only utility functions without affecting contract state.

Next Steps

• Add pagination or filtering for large datasets (e.g., users with many positions).
• Extend view functions with additional metadata (e.g., reward eligibility, vesting progress).
• Integrate these functions into frontend dashboards.