feat: Move tests next to code

[sanieni6]

Description

Simplify core test file structure by moving tests in /src next to code.

What type of PR is this? (check all applicable)

• [ ✅ ] 🧑‍💻 Code Refactor (refactor:)

Added tests?

• [✅ ] 👍 tested!

Added to documentation?

• [✅ ] 🙅 no documentation needed

Closing Issues

closes #467

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Latest commit: 0100d85

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[gershon]

Hi @sanieni6, we would like to include your updates in core package's next release, can you make your changes on a branch created from release branch feat/contract-v2. Lmk if you need more informations.