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Describe the problem

Blocker需要实时分应用监控流量详细信息，来和hosts禁用功能互相配合。
目前来说，实现一个VPN服务，去监控应用流量，并且展示是一个可行的方案。此方案不需要Root权限，可以在各个版本中的Android中使用。

Blocker needs real-time monitoring of detailed traffic information by application, in order to cooperate with the hosts disable function.
Currently, implementing a VPN service to monitor application traffic and display it is a feasible solution. This solution does not require root permissions and can be used on various versions of Android.

Describe the solution

1. 在core功能组下创建sniffer模块。这个模块可以提供创建VPN隧道的功能。
2. 对于用户的流量，我们应该需要在data模块下创建对应的Repository来缓存数据，把应用的流量记录到本地数据库中存放下来。以供后期查询。
3. Repository需要提供对网络流量的增删改查功能。

1. Create the "sniffer" module under the "core" group. This module can provide the function of creating VPN tunnels.
2. For user traffic, we should create a corresponding Repository under the "data" module to cache data and store application traffic records in a local database for later querying.
3. The Repository needs to provide functions for adding, deleting, modifying, and querying network traffic.

Additional context

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