Chore/remove old sdk

[Jakub-Vacek]

Description

This PR removes dependency on old pre 3.0.0 SDK and all the related commands/code. I used knip to detect dead code.

Files worth checking out are the modified (not removed) files.

Motivation and Context

Types of changes

• [ ] 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)

Checklist:

• [ ] I have updated the documentation accordingly. For updating Oclif commands documentation use oclif-dev.
• [ ] I have read the CONTRIBUTING document.
• [ ] I haven't repeated the code. (DRY)
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[Jakub-Vacek]

I can ask Eda :)

[Jakub-Vacek]

Not sure about major - technically all of deleted commands were already hidden from public API.

[Jakub-Vacek]

I talked with @TheEdward162 about minor/major. He is fine with both, I would go with minor. cc @kysely

[kysely]

My thinking behind major was that although this doesn't change the exposed interface, it still has breaking changes to the implementation. But I guess no one's really using these commands anyway 🤷‍♂️