Enhanced Bonding Curve Implementation

[spacexbt]

This PR introduces several improvements to the bonding curve implementation:

Changes Overview

1. Enhanced BondingCurveV2 contract with:

   • Improved price calculation with overflow protection
   • Additional safety checks and error handling
   • Minimum purchase amount to prevent dust
   • Integration with OpenZeppelin's Pausable contract
   • More precise mathematical calculations
   • Better event emission for price updates
   • Try-catch protection for external calls

2. Comprehensive test suite for BondingCurveV2:

   • Tests for all main functionality
   • Edge case testing
   • Event emission verification
   • Failure case testing
   • Price calculation verification

Technical Details

• Added overflow protection in mathematical operations
• Implemented MIN_PURCHASE threshold to prevent dust transactions
• Enhanced error handling with custom error types
• Improved price calculation precision
• Added event emission for price updates
• Integrated OpenZeppelin's Pausable contract for emergency stops

Testing

Added comprehensive test suite covering:

• Basic functionality
• Edge cases
• Error conditions
• Price calculation accuracy
• Event emission

All tests passing with full coverage of new features.