Lightweight vendor packages (AWS) - #1388
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该 PR 包含以下内容变更：
AWS SDK 大量使用了代码生成器生成序列化相关代码、且客户端存在大量 API 方法，编译时无法正常触发 DCE（上游相关 Issue： aws/aws-sdk-go-v2#2930 ），使得二进制体积急遽膨胀。
本次提交使用了自定义客户端+反射重新实现 HTTP 请求部分，但仍然复用官方 SDK 中的模型定义。
没有采用与 #1035 类似的裁剪方案，在于官方 SDK 实现较为复杂，无法简单化、易维护化地裁剪。
new: 91.90 MB
diff: -16.33%
注：仍有
github.com/aws/aws-sdk-go-v2/service/route53、github.com/aws/aws-sdk-go-v2/service/cloudfront两个模块没有替换，因为它们的官方 SDK 模型定义与 XML Schema 差异过大，无法直接复用。