Add dlt commands as Jupyter Notebook magic commands

[Vasilije1990]

Description

Non-interactive ipython magics that work in the notebooks or in the Ipython shell

• [ x] add magics for init, pipeline and other commands

• [ x] there's a known limitation on Colab - their file editor cannot show files starting with . the result is that users do not see the .dlt folder with secrets and configs. we should solve this somehow. ie. by dlt init that detects running on colab (there's a helper) and then creates a link ie. _dlt that is visible

• [ ] add a demo colab notebook and documentation to reference section of the docs -> Note, documentation was added, but there is a question of the colab notebook.

• [ ] run a notebook in Databrics

Implements #502

[netlify[bot]]

✅ Deploy Preview for dlt-hub-docs canceled.

Name	Link
🔨 Latest commit	91d2f7284d902edfdc50c04daf44bc5009976d6b
🔍 Latest deploy log	https://app.netlify.com/sites/dlt-hub-docs/deploys/65ae5823bde90b00087c2a7c