eKuiper 1.4.2 release

Overview

eKuiper 1.4.2 is a minor version that fixes several issues.

Fixes

• Fix a portable plugin function communication disorder problem

• Cache isAggregate call result for portable plugin functions

• Fix parseDynamicProp syntax conflict with mqtt topic that start with $ problem

Docs

• Correct docs for sink retry count
• Update dynamic properties syntax from json path to go data template
• Update docs layout