Modify wlan framework

[Sliverguo]

拉取/合并请求描述：(PR description)

[
1.修改wifi scan功能，不限制扫描ap个数。
2.删除wlan种work queue功能，wifi scan不需要缓存ap信息之后，基本不需要此功能。
3.支持wifi join的时候scan动作可配置。
4.支持快速连接。
]

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当前拉取/合并请求的状态 Intent for your PR

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• 本拉取/合并请求是一个草稿版本 This PR is for a code-review and is intended to get feedback
• 本拉取/合并请求是一个成熟版本 This PR is mature, and ready to be integrated into the repo

代码质量 Code Quality：

我在这个拉取/合并请求中已经考虑了 As part of this pull request, I've considered the following:

• 已经仔细查看过代码改动的对比 Already check the difference between PR and old code
• 代码风格正确，包括缩进空格，命名及其他风格 Style guide is adhered to, including spacing, naming and other styles
• 没有垃圾代码，代码尽量精简，不包含#if 0代码，不包含已经被注释了的代码 All redundant code is removed and cleaned up
• 所有变更均有原因及合理的，并且不会影响到其他软件组件代码或BSP All modifications are justified and not affect other components or BSP
• 对难懂代码均提供对应的注释 I've commented appropriately where code is tricky
• 本拉取/合并请求代码是高质量的 Code in this PR is of high quality
• 本拉取/合并使用formatting等源码格式化工具确保格式符合RT-Thread代码规范 This PR complies with RT-Thread code specification

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✅ geniusgogo
❌ zetingxu

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[chenyingchun0312]

一般会使用这个脚本格式化一下，就不会包格式错误了： https://github.com/mysterywolf/formatting

[enkiller]

1. 不限制扫描ap个数
2. wifi scan不需要缓存ap信息
3. wifi join的时候scan动作可配置

上面三个功能，可以通过新增 API 的方式实现吗？原有的功能仍保留

[Sliverguo]

Good job！