Improve notebooks with new logic of TSDataset

[alex-hse-repository]

🚀 Feature Request

Now Transforms works with TSDataset, the core mechanic has changed and we need to reflect this changes in the notebooks.

Proposal

1. Improve Get Started

• Add transforms parameter to transform/inverse_transform/make_future
• Add inverse_transform step after forecast

2. Improve Custom Transform and Model

• Should cover the logic of adding reversible/irreversible transforms in new arch

Test cases

No response

Additional context

No response