WIP:optimize(hz): generate enum marshal and unmarshal separately

[FGYFFFF]

What type of PR is this?

optimize

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修改 thrift 生成 enum marshal/unmarshal 的行为

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en: generate enum marshal and unmarshal separately
zh(optional):
之前的 thriftgo 提供了"json_enum_as_text" 选项，该选项的描述是只生成 enum 的 marshalText 能力；但是实际使用后会将 "marshalText"&"unmarshalText"都生成出来，因此做了一次更细粒度的生成。
行为不一致:

• 之前默认不生成 unmarshal，修改后默认都生成 unmarshal()。这个才是合理的默认行为

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (e02c162) 81.86% compared to head (522a73e) 81.86%.

❗ Current head 522a73e differs from pull request most recent head 0e0addb. Consider uploading reports for the commit 0e0addb to get more accurate results

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #980   +/-   ##
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  Coverage    81.86%   81.86%           
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  Files           98       98           
  Lines         9932     9932           
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  Hits          8131     8131           
  Misses        1311     1311           
  Partials       490      490           

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