feat: migrating storage to version v3

[izaaz]

Summary

This is a fairly big PR so i'll explain everything that is going on in here

1. Storage context - This is a new class that lets you access storage from older versions. All the old version files were hardcoded in different places so this should provide us a clean way of accessing data from older storage versions.
2. Created a new class AndroidStorageV2. The old AndroidStorage class was creating directories inside the storage layer. The v2 is a copy of the old AndroidStorage but just takes in storage directory and shared preferences as input. The old class is kept around for backwards compatibility if someone out there is still using it.
3. Properties file - similar change. It was concatenating different fields and so I moved that logic outside this class.
4. Migration manager - This class is responsible for migrating data from old storage versions to the latest version. We always migrate from old version directly to the new storage version. No intermediate migrations.

I still need to add diagnostics, but that will come in a different PR.

Here's the storage structure

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