增加DerefPtr泛型解引用函数

[bigdavidwong]

• DerefPtr对于传入的指针进行安全的指针解引用，若引用指针为nil则返回该类型的空值，实现一些指针字段传递时不用多写一段判空的逻辑；

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.66%. Comparing base (0a2320e) to head (4e8b78c).
⚠️ Report is 1 commits behind head on dev.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #283      +/-   ##
==========================================
- Coverage   94.73%   94.66%   -0.08%     
==========================================
  Files          75       75              
  Lines        3798     3804       +6     
==========================================
+ Hits         3598     3601       +3     
- Misses        161      163       +2     
- Partials       39       40       +1     

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