Improve the performance by reducing duplicated reflect usage on the s…

[wln32]

1. 请求开始的时候，直接反射验证数据是否合法,并返回reflect.Value，后续所有操作可以不用重复反射对象
2. 修正了测试 ghttp_z_unit_feature_request_struct_test.go：510

[gqcn]

@wln732 The ci fails.

[gqcn]

涉及较核心逻辑代码调整，需要花点时间review。

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Involving core logic code adjustments, it will take some time to review.

[wln32]

涉及较核心逻辑代码调整，需要花点时间review。
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其实设置default 和in tag 那里可以直接用反射赋值了，不需要再去判断data里有没有同名的，这样实现也很直观，如果data中设置了值，那后面再走gocnv.Struct这里赋值就好了

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Involving core logic code adjustments, it will take some time to review.
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In fact, when setting default and in tag, you can directly use reflection to assign values. There is no need to judge whether there is a value with the same name in the data. This implementation is also very intuitive. If the value is set in the data, then go to gocnv.Struct to assign the value later. Got it

[gqcn]

空字符串也是值，这里恐怕不能直接删掉哦？！

[wln32]

这里当时考虑的是，前端传的空值没啥意义，所以就把他删掉了

[gqcn]

@wln32 这块代码看起来有点花时间，能否描述下你的改动思路？

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@wln32 This code looks a bit time-consuming. Can you describe your idea of ​​changing it?

[wln32]

@wln32 这块代码看起来有点花时间，能否描述下你的改动思路？

@gqcn
先放放吧，后面在更新，
其实这块的代码，可以先做请求校验，然后在用gconv做赋值，还有defaut和header那里也可以再优化优化

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@wln32 This code looks a bit time-consuming. Can you describe your ideas for changes?

I'll leave it for now, I'll update it later.
In fact, for this piece of code, you can first do request verification, and then use gconv to do the assignment. You can also optimize defaut and header.