Guide clients away from withAttributeValues in EncryptionContext

withAttributeValues is OK to be exposed to the SDK via package private or some other means, but clients aren't intended to use it.

The solution we discussed was to deprecate this method. Maybe there is another way to convince clients not to use it.

在 EncryptionContext 中定位 withAttributeValues，并检查 SDK 如何公开和使用它。在选择方案之前，审查相关 API 以及现有的弃用指南或测试。完成的标准是明确劝阻客户端使用该方法，同时 SDK 仍能访问所需的功能。

由索引模型根据 Issue 内容生成。