fix debounceTime no work error and support select component load data util focus

[ldwonday]

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[ldwonday]

利用一个focusRef变量来控制组件是否被focus了，默认值是!fieldProps.searchOnFocus，这个变量被传递到fetch方法中。

当searchOnFocus=true时focusRef为false，那么渲染完成就不会发请求了。 当searchOnFocus=false|undefined|null时focusRef为true，那么渲染完成后就会发请求。

如果组件被focus了，onFocus里会设置focusRef=true，当searchOnFocus = true时之后再调用fetchData就会发请求了。

[ldwonday]

@chenshuai2144 这里吧

[chenshuai2144]

我理解一下你的意思，你是希望增加个属性，让组件在选中的时候发一次请求吗

[ldwonday]

@chenshuai2144 是的哈，表单有很多的select都需要远程加载数据，但是如果页面一渲染就都去加载数据哪完全没必要（labelInValue模式下），我希望的是只有点击的时候才去加载下拉框的数据。所以希望增加一个类似loadUtilClick的属性。

[chenshuai2144]

ok, 看看测试用例怎么了

[codecov[bot]]

Codecov Report

Base: 98.81% // Head: 98.80% // Decreases project coverage by -0.01% :warning:

Coverage data is based on head (b99ac2c) compared to base (bf3fd22). Patch coverage: 92.85% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #5947      +/-   ##
==========================================
- Coverage   98.81%   98.80%   -0.02%     
==========================================
  Files         268      268              
  Lines        7881     7892      +11     
  Branches     2792     2721      -71     
==========================================
+ Hits         7788     7798      +10     
- Misses         93       94       +1     

Impacted Files	Coverage Δ
packages/form/src/components/SchemaForm/index.tsx	100.00% <ø> (ø)
packages/field/src/components/Select/index.tsx	99.52% <92.30%> (-0.48%)	:arrow_down:
...field/src/components/Select/SearchSelect/index.tsx	97.43% <100.00%> (ø)

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