Extract `QueueManager` and local storage related code. Cover with unit tests.

[wzieba]

Description

This PR extracts logic of QueueManager and extracts local storage related code, encapsulating it to LocalStorageRepository class.

It doesn't do anything related to threading model, so it's safe to merge this to main. After merge, I'll back port it to coroutines branch.

[codecov[bot]]

Codecov Report

Attention: 13 lines in your changes are missing coverage. Please review.

Comparison is base (fcb6d7c) 44.38% compared to head (1b8ffca) 51.63%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #87 +/- ## ========================================== + Coverage 44.38% 51.63% +7.24% ========================================== Files 8 10 +2 Lines 365 368 +3 Branches 56 55 -1 ========================================== + Hits 162 190 +28 + Misses 189 165 -24 + Partials 14 13 -1 ``` | [Files](https://app.codecov.io/gh/Parsely/parsely-android/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Parsely) | Coverage Δ | | |---|---|---| | [...in/java/com/parsely/parselyandroid/QueueManager.kt](https://app.codecov.io/gh/Parsely/parsely-android/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Parsely#diff-cGFyc2VseS9zcmMvbWFpbi9qYXZhL2NvbS9wYXJzZWx5L3BhcnNlbHlhbmRyb2lkL1F1ZXVlTWFuYWdlci5rdA==) | `100.00% <100.00%> (ø)` | | | [...ava/com/parsely/parselyandroid/ParselyTracker.java](https://app.codecov.io/gh/Parsely/parsely-android/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Parsely#diff-cGFyc2VseS9zcmMvbWFpbi9qYXZhL2NvbS9wYXJzZWx5L3BhcnNlbHlhbmRyb2lkL1BhcnNlbHlUcmFja2VyLmphdmE=) | `11.48% <25.00%> (-0.41%)` | :arrow_down: | | [...m/parsely/parselyandroid/LocalStorageRepository.kt](https://app.codecov.io/gh/Parsely/parsely-android/pull/87?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Parsely#diff-cGFyc2VseS9zcmMvbWFpbi9qYXZhL2NvbS9wYXJzZWx5L3BhcnNlbHlhbmRyb2lkL0xvY2FsU3RvcmFnZVJlcG9zaXRvcnkua3Q=) | `75.86% <75.86%> (ø)` | |

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[wzieba]

Thanks for the review @ParaskP7 ! I'll proceed with the merge as I think we discussed or addressed every comment.

[ParaskP7]

Great, thanks for the extra commit and answering my comments @wzieba , LGTM! 🙇 🌟 🚀