feat: support concurrency limit

[thep0y]

relate: https://github.com/ant-design/ant-design/issues/28950

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[afc163]

@MadCcc 看看

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Codecov Report

Attention: 14 lines in your changes are missing coverage. Please review.

Comparison is base (6027d4c) 87.21% compared to head (050b5fb) 82.91%.

:exclamation: Current head 050b5fb differs from pull request most recent head bae65e1. Consider uploading reports for the commit bae65e1 to get more accurate results

Files	Patch %	Lines
src/asyncPool.ts	0.00%	13 Missing :warning:
src/AjaxUploader.tsx	85.71%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #541 +/- ## ========================================== - Coverage 87.21% 82.91% -4.30% ========================================== Files 6 7 +1 Lines 266 281 +15 Branches 72 76 +4 ========================================== + Hits 232 233 +1 - Misses 34 48 +14 ```

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[afc163]

看上去得补一些用例，测试覆盖率下降了。

[thep0y]

早上试了一下，xhr 请求虽然是异步的不受异步控制，asyncPool没有发挥作用，需要使用别的方式实现，是否考虑将请求方法改用fetch？

[afc163]

1. xhr 改 fetch 变动会比较大，我不建议为了加新特性动底层。
2. 上传逻辑的自定义最灵活的方式是 customRequest，所以是不是做个内置的 concurrencyRequest 方便开发者直接使用就好？

[thep0y]

1. xhr 改 fetch 变动会比较大，我不建议为了加新特性动底层。
2. 上传逻辑的自定义最灵活的方式是 customRequest，所以是不是做个内置的 concurrencyRequest 方便开发者直接使用就好？

方式 2 确实可能更好。

[thep0y]

换种方式实现