支持多维数组转化

[ZoMinster]

数组字典多维混合结构待支持，准备增加新的配置类方法加以实现

[codecov-io]

Codecov Report

Merging #265 into master will decrease coverage by 5.3%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #265      +/-   ##
==========================================
- Coverage   99.28%   93.98%   -5.31%     
==========================================
  Files           2        2              
  Lines        1540     1546       +6     
  Branches        0      424     +424     
==========================================
- Hits         1529     1453      -76     
+ Misses         11        7       -4     
- Partials        0       86      +86

Impacted Files	Coverage Δ
YYModel/NSObject+YYModel.m	93.39% <100%> (-5.83%)	⬇️
YYModel/YYClassInfo.m	96.92% <0%> (-2.7%)	⬇️

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[ZoMinster]

现在自定义多维数组中元素类型需要实现modelCustomTransformFromDictionary方法自己实现转化，这种情况现在挺多的，我这个支持了多维数组自定义数组元素类型，希望大神看看是否可行

[shicymenta]

怎么使用啊 没看懂啊
[[{}]] 这种结构该怎么解析啊