Adds the ability to define how to store a user

[1vank1n]

Description of the Change

Faced a problem that it is not possible now to specify the user's storage location in the validator. This functionality is now a separate public method that can be easily reused. If you agree with me, I will implement the rest of the checklist items (tests, docs, etc.).

Checklist

• [x] PR only contains one change (considered splitting up PR)
• [x] unit-test added
• [x] documentation updated
• [x] CHANGELOG.md updated (only for user relevant changes)
• [x] author name in AUTHORS

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 97.44%. Comparing base (560f84d) to head (c326d04). Report is 9 commits behind head on master.

:exclamation: Current head c326d04 differs from pull request most recent head a0ba9d7. Consider uploading reports for the commit a0ba9d7 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1328 +/- ## ========================================== - Coverage 97.56% 97.44% -0.12% ========================================== Files 32 32 Lines 2132 2076 -56 ========================================== - Hits 2080 2023 -57 - Misses 52 53 +1 ```

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[n2ygk]

@1vank1n sorry for the delay in looking at this. It seems like a reasonable thing to have. Please rebase and do the checklist stuff:

• [ ] unit-test added
• [ ] documentation updated
• [ ] CHANGELOG.md updated (only for user relevant changes)
• [ ] author name in AUTHORS

[1vank1n]

@1vank1n sorry for the delay in looking at this. It seems like a reasonable thing to have. Please rebase and do the checklist stuff:

• [ ] unit-test added
• [ ] documentation updated
• [ ] CHANGELOG.md updated (only for user relevant changes)
• [ ] author name in AUTHORS

I've added it. If it needs anything, please let me know