refactor: store instantiation

[Freyskeyd]

Description

ValidatorStore is able to create the whole set of others stores. This PR is refactoring a bit how we access the open method to create the store.
Calling new with a single path will create the whole set of stores.

PR Checklist:

• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added or updated tests that comprehensively prove my change is effective or that my feature works

[codecov]

Codecov Report

Attention: Patch coverage is 96.87500% with 1 lines in your changes are missing coverage. Please review.

❗ No coverage uploaded for pull request base (main@cc0c7b5). Click here to learn what that means.

Files	Patch %	Lines
crates/topos-test-sdk/src/storage/mod.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #461   +/-   ##
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  Coverage        ?   70.79%           
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  Files           ?      226           
  Lines           ?    12421           
  Branches        ?        0           
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  Hits            ?     8793           
  Misses          ?     3628           
  Partials        ?        0           

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