feat(pkgs): relocate idempotency package

[VictorAvelar]

Description

Move idempotency package to new location.

Motivation and context

Closes #289

How has this been tested?

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see how your change affects other areas of the code, etc.

• Unit tests added / updated
• The tests run on docker (using make test)
• The required test data has been added / updated

If you are running the tests locally, please specify:

• OS: macos Sonoma 14.0
• Go version 1.20.5

Types of changes

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• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• This change requires a documentation update

Checklist

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• If my change requires a change to the documentation, I have updated it accordingly.