Support auto-loading appropriate ims context based on program id mapping

Currently only one Adobe IO JWT can be stored inside the aio config (because only the key `jwt-auth`) is used. For working with multiple accounts in parallel it would be beneficial if multiple JWT authentication configs could be stored in parallel and bound to specific Cloud Manager Program ID.
Maybe supporting a key config naming scheme like `jwt-auth.` would be sufficient. If no such key is found, the fallback could be the key `jwt-auth`.

首先定位 aio 配置读取 jwt-auth 键的位置，以及 Cloud Manager program ID 可用的位置。在保持多个账户可并行使用的同时，验证所提议的 jwt-auth. 查找方式，并以 jwt-auth 作为回退；为两条选择路径添加或更新测试。

由索引模型根据 Issue 内容生成。