Add enhanced error handling utilities

[spacexbt]

This PR adds enhanced error handling utilities to improve the robustness of the SDK:

1. Added new error handling utilities:

   • Custom exception classes for better error handling
   • Address validation function
   • Numeric parameter validation
   • Retry mechanism with exponential backoff

2. Key improvements:

   • Better error messages for invalid parameters
   • Automatic retries for failed API calls
   • Input validation for common parameters
   • Type-safe error handling

3. Usage example:

from hyperliquid.utils.error_handling import retry_on_failure, validate_address

# Validate Ethereum addresses
address = "0x..."
if not validate_address(address):
    raise InvalidParameterError("Invalid Ethereum address")

# Add retry mechanism to API calls
@retry_on_failure(max_retries=3)
def make_api_call():
    # Your API call here
    pass

This will help make the SDK more robust and user-friendly by providing better error handling and validation.