request help: replacing std/json with json-iterator/go

[kwanhur]

Issue description

Improving json decode conf performance, use json-iterator/go to replace encoding/json on plugins implement.

Environment

• APISIX Go Plugin Runner's version:
• APISIX version:
• Go version:
• OS (cmd: uname -a):

[spacewander]

Is there any report about the std/json affecting the performance in the hot path? We would prefer to use the std library if the performance is not critical.