[Shared] Config and Genesis refactoring improvement: ValidateConfig has to work with mocks and real implementation

[deblasis]

Objective

Keep track and address areas of improvement. Specifically, in this issue we aim at addressing the comments below

Related PR #235

Origin Document

• [Shared] Config and genesis handling refactoring idea #235 (comment)

Goals

• Improve code quality

Deliverable

• Refactor the code so that there's no ambiguity

Non-goals / Non-deliverables

• Changes in logic

General issue deliverables

• Update the appropriate CHANGELOG
• Update any relevant READMEs (local and/or global)
• Update any relevant global documentation & references
• If applicable, update the source code tree explanation
• If applicable, add or update a state, sequence or flowchart diagram using mermaid

[Optional] Testing Methodology

• _REPLACE_ME: Make sure to update the testing methodology appropriately_
• Task specific tests: make ...
• All tests: make test_all
• LocalNet: verify a LocalNet is still functioning correctly by following the instructions at docs/development/README.md

---

Creator: @deblasis
Co-Owners: @Olshansk

[deblasis]

We are using interfaces now, this can be closed