IsChunk returns `true` if a message matches the chunk header regex.

NewNotifier creates a new Notifier that is used to send notifications.

ParseChunk parses a message chunk and returns a ChunkInfo struct populated with the chunk data.

ErrChunkTooSmall Received a chunk that is <= the header size, which means the chunk contains no data.

ErrMessageToLarge Breaking the message into chunks will result in more chunks than the `maxChunks` permitted.

ChunkInfo is used by ParseChunk to return parsed chunk data.

Provider is implemented by the end user and passes messages or chunks from the Notifier to the messaging system, e.g., Postgres NOTIFY.