Module error 

Hierarchical error types for VoltDB client.

This module provides structured error types organized by category:

• ConnectionError - Network and connection-related errors
• ProtocolError - Wire protocol parsing and encoding errors
• QueryError - Query execution and result handling errors

The main VoltError type wraps these subcategories for backward compatibility.

Structs

ConcurrencyError

Concurrency-related errors.

Enums

ConnectionError

Connection-related errors.

ProtocolError

Protocol-related errors (wire format, parsing).

QueryError

Query execution and result handling errors.

Traits

IntoVoltError

Helper trait to convert subcategory errors to VoltError.