Enhance TypeReference classes and comments

[kraity]

No description provided.

[codecov-commenter]

Codecov Report

Merging #51 (764da76) into main (9dbc40b) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##               main      #51      +/-   ##
============================================
- Coverage     64.78%   64.76%   -0.02%     
  Complexity     7984     7984              
============================================
  Files           414      414              
  Lines         45245    45245              
  Branches       9140     9140              
============================================
- Hits          29310    29304       -6     
- Misses        12389    12393       +4     
- Partials       3546     3548       +2     

Impacted Files	Coverage Δ
...main/java/com/alibaba/fastjson2/TypeReference.java	87.50% <100.00%> (ø)
...ain/java/com/alibaba/fastjson2/JSONWriterUTF8.java	74.71% <0.00%> (-0.26%)	⬇️
...ain/java/com/alibaba/fastjson2/util/BeanUtils.java	67.86% <0.00%> (-0.20%)	⬇️
...in/java/com/alibaba/fastjson2/JSONWriterJSONB.java	57.43% <0.00%> (-0.19%)	⬇️
...rc/main/java/com/alibaba/fastjson2/JSONReader.java	73.30% <0.00%> (-0.11%)	⬇️

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[wenshao]

TypeReference上增加的parseObject & parseArray是很好的注意，非常棒！

[kraity]

TypeReference上增加的parseObject & parseArray是很好的注意，非常棒！

哈哈, 感谢温少的点赞. 我也作为FASTJSON的用户, 所以在使用上尽量考虑到用户使用的想法