feat: Allow to copy files from the original build

[JanStevens]

Feature Request

Description

Context: A multi tenant application where a single code base is used to create multiple branded customer apps.
We want to use live updates and create a single update which can be applied for all our customers. We have some json configuration files which are tenant specific and need to be present before the app can properly booth.
Right now when a live update is applied it nukes the public dir and replace it, this way we lose our tenant specific json configuration files.

Platform(s)

• ios
• android

Preferred Solution

Possible solutions:

1. Be able to exclude files from being overwritten
2. Be able to copy over files from a native bundle after applying the update

Alternatives

Our current solution would be to use @capacitor/preferences or we write our own native plugin which reads information from capacitor configuration file.

Additional Context

https://discord.com/channels/912707985829163099/1333794658039365682