Storage

[xh3b4sd]

abstract

This PR improves the storage implementation. Here we separate the code based on its implementation details. Several storage interfaces are defined to distinguish between various data types certain storage implementations are managing.

checklist

• [x] Make sure you read and understood the CONTRIBUTING.md.
• [x] Make sure you applied sufficient labels, milestone and assignee.
• [x] Make sure all TODOs are addressed.
• [x] Make sure there is sufficient documentation.
• [x] Make sure there are sufficient tests.
• [x] Make sure all commits are squashed before merging.
• [x] Make sure to delete the feature branch after merging.

[codecov-io]

Current coverage is 92.25% (diff: 88.74%)

Merging #234 into master will increase coverage by 0.15%

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