feat: add position management and liquidity calculation to LiquidityManagerV2

[SynnekOG]

PR Description

Summary

This PR extends LiquidityManagerV2 with new internal functions to manage user positions and simplify liquidity handling, while improving event consistency.

Changes

• Internal Functions

  • Added _createPosition:
    • Records user liquidity positions with full metadata (tokens, fee tier, ticks, liquidity, amounts, timestamp).
  • Added _calculateLiquidity:
    • Provides a simplified liquidity calculation for deposited token amounts.

• Event Updates

  • Updated emitted events to unwrap Currency types for clarity and consistency.

• Refactoring

  • Adjusted _setupVesting to unwrap currency0 before use.

Impact

• Enables proper tracking of user liquidity positions for analytics and withdrawals.
• Establishes groundwork for integrating with Uniswap V4 liquidity math in the future.
• Improves event readability for off-chain indexers and dashboards.

Next Steps

• Integrate real Uniswap V4 math libraries for liquidity calculations.
• Add events for position creation and updates.
• Expand _createPosition to support position removal/updates.