fastjson 经常出漏洞问题 建议替换fastjson或者增加其他json库适配

source的读取是可以自定义json库读取的 但是在sentinel-transport-common中是依赖fastjson的 这里能否替代掉 或者可适配其他json库

Start by inspecting the fastjson dependency and JSON-reading path in sentinel-transport-common, then compare it with the customizable source JSON reader mentioned in the issue. Done means the transport module has an agreed replacement or supported alternative JSON-library integration, with its compatibility and verification requirements documented.

Written by the indexing model from the issue text.