fix generated code format

[wangyuheng]

1. 缩进修改为4个空格
2. \r\n 替换 \n 作为换行符
3. lambda 方法移除 {} 避免格式换行

close #46

[codecov[bot]]

Codecov Report

Merging #50 (6888843) into release/1.4.0 (f2e7f30) will increase coverage by 0.26%. The diff coverage is 75.00%.

@@                 Coverage Diff                 @@
##             release/1.4.0      #50      +/-   ##
===================================================
+ Coverage            63.82%   64.09%   +0.26%     
- Complexity             167      169       +2     
===================================================
  Files                  110      110              
  Lines                 2195     2189       -6     
  Branches               152      152              
===================================================
+ Hits                  1401     1403       +2     
+ Misses                 721      713       -8     
  Partials                73       73              

Impacted Files	Coverage Δ	Complexity Δ
...hcare/arc/generator/codegen/util/JavadocUtils.java	87.50% <50.00%> (+22.50%)	8.00 <0.00> (+1.00)
...ealthcare/arc/generator/codegen/TypeGenerator.java	96.66% <100.00%> (-0.06%)	9.00 <0.00> (ø)
...ub/yituhealthcare/arc/generator/io/CodeWriter.java	87.50% <100.00%> (+18.75%)	6.00 <1.00> (+1.00)

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