[BUG]com.alibaba.fastjson2.util.FDBigInteger构造函数初始化的时候trimLeadingZeros方法死循环

### 问题描述
*在反序列化double类型时，com.alibaba.fastjson2.util.FDBigInteger构造函数在初始化时会使用到trimLeadingZeros方法，这个方法内部有个while操作导致cpu飙升*

### 环境信息
*请填写以下信息：*

- OS信息： [e.g.：CentOS 8.4.2105 4Core 3.10GHz 16 GB]
- JDK信息： [e.g.：Openjdk 1.8.0_312]
- 版本信息：[e.g.：Fastjson2 2.0.47]

Start with com.alibaba.fastjson2.util.FDBigInteger and inspect trimLeadingZeros during double deserialization. Reproduce the reported CPU spike with the available issue details, then verify that construction completes normally and add or update a regression test if the repository provides a relevant test location.

Written by the indexing model from the issue text.