[CDF-25976] 😅 Migrate dataset commands (#2100)

# Description

**Context**: This is part of the `alpha` migration tooling in Toolkit,
for overview [see
here](https://cognitedata.atlassian.net/wiki/spaces/~170890702/pages/5455773697/Migration+Tooling+in+Toolkit).
This is a new step between 2 and 3.

Before we can migrate assets/event/files/timeseries/sequences, we need
to have a destination target space as well as CogniteSourceSystems
created.

This PR adds the CLI interface for triggering the command introduced in
#2099

<img width="941" height="278" alt="image"
src="https://github.com/user-attachments/assets/8eb9a39d-1cdd-4561-abda-17c848c90027"
/>


## Changelog

- [x] Patch
- [ ] Skip

## cdf

### Added

- [alpha] This adds `cdf migrate data-sets` which create instance spaces
from datasets.

## templates

No changes.
