Add transient state library reference description with mdx formatting

[krisoshea-eth]

This PR introduces a reference guide on the Transient State Library in Uniswap V4.

Key Features of the Document:

1. Introduction to the Transient State Library and its role in Uniswap V4
2. Detailed explanation of key concepts, including transient storage and its implementation in Uniswap V4
3. Comprehensive breakdown of the library's functions:
   • getReserves
   • getNonzeroDeltaCount
   • currencyDelta
   • isUnlocked
4. Explanation of the usage and importance of the Transient State Library in Uniswap V4's operations
5. Guide on integrating the Transient State Library with the PoolManager contract
6. Code snippets demonstrating function signatures and usage examples

Document Structure:

• Uses MDX formatting with frontmatter
• Provides detailed explanations alongside code snippets
• Includes tables for function parameters
• Follows a logical flow from concept introduction to implementation details and usage examples

Impact and Importance:

This document provides detailed insights into the Transient State Library, which is fundamental to Uniswap V4's gas optimization strategies and efficient state management. Understanding this library is essential for developers implementing or interacting with Uniswap V4 pools, especially when dealing with multi-currency pools and complex swap operations.

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