Add ability to suppress error messages to console/stderr

[asonje]

The qatlib library currently outputs error messages to console/stderr even when the calling application receives appropriate error return codes. This creates redundant console clutter, especially problematic for applications with fallback mechanisms that gracefully handle QAT errors.

Current Behavior

• Error messages are always printed to stderr regardless of application needs
• Messages are redundant since proper error codes are returned to the caller
• No programmatic way to suppress these messages

Impact

• Console output is cluttered with non-actionable error messages
• Poor user experience
• Current workaround of redirecting stderr is not always feasible

Requested Feature

A programmatic API or configuration option to suppress error message output while maintaining proper error code returns, allowing applications to handle errors silently when appropriate.