feat(LiquidityManagerV2): add mappings for pools, positions, and tokens

[ASingaley]

PR Description

Summary

Introduces new mapping structures to LiquidityManagerV2 for improved pool management, user tracking, and token support.

What's Changed

• Added Mappings Section Header for clarity
• Introduced:
  • poolInfo → store pool details by token pair
  • userPositions → track liquidity positions per user
  • supportedTokens → define which tokens can be used in liquidity provision
  • poolKeys → simplify access to pool identifiers
  • tokenPairToPoolId → map token pairs to pool IDs
• Applied forge fmt for consistent formatting

Why

• Improves organization and readability of contract state.
• Provides essential structures for managing liquidity pools and user positions.
• Lays groundwork for future pool operations and validations.

Impact

• Expands LiquidityManagerV2 functionality.
• No breaking changes, safe to merge.