Use built-in json package instead of json-iterator

[khiemdoan]

The json-iterator package is no longer maintained; its last update was two years ago (Sep 16, 2022)

There are numerous issues related to performance and crashes, such as:

• The performance is getting much worse since upgrade from go 1.19 to go 1.22 modern-go/reflect2#31
• Is json-iterator support "arena" package in golang 1.20 ? json-iterator/go#671
• Json-iterator Decoder should handle EOF correctly json-iterator/go#494
• MarshalToString "map[string]bool" get error: unexpected fault address 0xffffffffffffffff json-iterator/go#658

Some projects have removed it, including:

• switch from json-iterator to forked stdlib json decoder kubernetes/kubernetes#105030
• client/v2: remove unsafe json-iterator/reflect2 etcd-io/etcd#13439

I think it’s better to use the built-in json package for the best compatibility.

[xyq-c-cpp]

thanks for your feedback, we would fix this later. @khiemdoan