[ENG-6216 : Add rust code for getting filepath with compations/logs](https://linear.app/comm/issue/ENG-6216/add-rust-code-for-getting-filepath-with-compationslogs)
Adds two new functions for files used for backup data storage on the device (while they are waiting to be confirmed by backup service): one for logs (with optional attachments file) and the second one for userkeys file.
Depends on D10604