feature: IRCv3 Standard Replies

[lrstanley]

✨ Describe the feature you'd like

Ref: IRCv3 Standard Replies

Introduction

This document specifies the standard FAIL, WARN, and NOTE messages, intended to provide a clean, consistent interface for sending general errors, warnings, and informational messages to clients. Implementers should not need to reserve new numerics for error, warning, or general informational messages, especially as numerics themselves and the mapping of numerics to names can be unclear or conflicting.

The FAIL message indicates a complete failure to process a given command/function, or simply some error about the current session that clients should be aware of.

The WARN message indicates some non-fatal feedback about a given command/function, or some less vital feedback on the current session.

The NOTE message indicates some informational message about a given command/function, or about the current session.

Once support is added, the IRCv3 Library Support page needs to be updated to include these features.