workflow v0.11.2

New Features

• Add watch_timeout for network task.
• Add address_family for endpoint params. Enable users to specify target's IP address family, including DNS server.
• Add 'guard' task wrapper for global non-block locking.
• Reduce max encoding IO vectors from 8192 to 2048 and reduce 96KB stack using.

Improvements

• Optimize named timer's speed. About 3 times faster.
• Reduce light-weighted thread task's overhead.
• Optimize DNS resolving a lot. Reduce redundant DNS requests when querying a single host name parallelly.
• Optimize JSON parser when parsing JSON numbers.
• Simpify poller code and optimize timeout checking.

Bug Fixes

• Fix kafka client bug when enable retry.