refactor(mobile): validate checksum before upload

[shenlong-tanwen]

Follows #7090

This is a WIP branch to test using checksum for validating assets before uploading them to the server.

Changes made in the PR

• Refactor BackupState into different classes specific to current backup state and backup settings
• Removeed DuplicateAsset collection
• Changes the background service to sync local albums first on asset change and use regular upload flow. This will help us further unify the upload flow

TODO:

• [ ] Verify background upload