NSQ HA

1. adjust ready recovery after error
2. avoid some lock while get stats
3. fix the ordered consume offset while in skipped state
4. handle write block while read timeout
5. Delayed queue optimized

NSQ HA

First release after moved.

• Introduce new disk delayed queue for each channel. More delayed messages for channel (delay up to 3 days).
• Support custom message extend header. The extend header can be used to filter some messages or do the specific actions based on different message header.
• Support different dispatch priority based on the client. Some tagged messages will be dispatched to the specific client with the same desired tag first.
• More effective e2e processing latency