add support for castToBigInteger in TypeUtils

[metal-huang]

What this PR does / why we need it?

应用升级到该兼容包时，由于缺少castToBigInteger 方法导致无法编译。

Summary of your change

为TypeUtil增加castToBigInteger方法。

Please indicate you've done the following:

• Made sure tests are passing and test coverage is added if needed.
• Made sure commit message follow the rule of Conventional Commits specification.
• Considered the docs impact and opened a new docs issue or PR with docs changes if needed.

[CLAassistant]

All committers have signed the CLA.

[codecov-commenter]

Codecov Report

Base: 74.48% // Head: 74.48% // Decreases project coverage by -0.01% ⚠️

Coverage data is based on head (312ed7b) compared to base (73f81c0).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1145      +/-   ##
============================================
- Coverage     74.48%   74.48%   -0.01%     
  Complexity    18521    18521              
============================================
  Files           716      716              
  Lines         76401    76402       +1     
  Branches      16378    16378              
============================================
  Hits          56907    56907              
  Misses        12635    12635              
- Partials       6859     6860       +1     

Impacted Files	Coverage Δ
...main/java/com/alibaba/fastjson/util/TypeUtils.java	36.34% <100.00%> (+0.07%)	⬆️
...rc/main/java/com/alibaba/fastjson2/JSONReader.java	71.04% <0.00%> (-0.06%)	⬇️

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