Override the get method on JSONObject

[kraity]

覆盖 JSONObject 上的 get 方法以确保原始数据键也能够映射

JSONObject jsonObject = JSONObject.of("123", "value1", "456.789", "value2", null, "value3");
assertEquals("value1", jsonObject.get(123));
assertEquals("value2", jsonObject.get(456.789));
assertEquals("value3", jsonObject.get(null));
assertEquals("value4", jsonObject.getOrDefault(false, "value4"));

[codecov-commenter]

Codecov Report

Merging #54 (c292625) into main (857b474) will increase coverage by 0.00%.
The diff coverage is 87.50%.

@@            Coverage Diff            @@
##               main      #54   +/-   ##
=========================================
  Coverage     64.76%   64.76%           
- Complexity     7991     7996    +5     
=========================================
  Files           414      414           
  Lines         45274    45284   +10     
  Branches       9144     9144           
=========================================
+ Hits          29321    29330    +9     
+ Misses        12402    12401    -1     
- Partials       3551     3553    +2     

Impacted Files	Coverage Δ
...src/main/java/com/alibaba/fastjson2/JSONArray.java	93.43% <ø> (ø)
...rc/main/java/com/alibaba/fastjson2/JSONObject.java	85.01% <87.50%> (+0.66%)	⬆️
...ain/java/com/alibaba/fastjson2/JSONWriterUTF8.java	74.71% <0.00%> (-0.13%)	⬇️
...in/java/com/alibaba/fastjson2/JSONWriterJSONB.java	57.43% <0.00%> (-0.10%)	⬇️

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