Migrate from ObjectBox to Room

[gouri-panda]

We previously discussed why it's important for our applications in #3091

Describe the solution you'd like
We can create helper classes that migrate the previous data of the user to the new room database and then refactor necessary the code along the way.

[kelson42]

@gouri-panda What are all the sub-tasks? You can first list them here in the form a a bullet list.

[gouri-panda]

@kelson42 Subtasks are in #3102 .

[kelson42]

OK, I have created a project with the same purpose, so I guess this ombrela ticket can be closed.