Implements specific exception classes for all Discord API error codes to provide more granular error handling and better debugging experience.
Creates individual exception classes for each Discord error code (10001-520006) with descriptive names and documentation strings that include the official error messages and codes.
Updates HTTP client to automatically map Discord error codes to their corresponding exception classes, allowing developers to catch specific error types rather than generic HTTP exceptions.
Includes comprehensive test coverage for the new error code mapping functionality to ensure correct exception raising based on API responses.
