feat(notebooks): adding collaborative option

[michalmrazek]

Describe your changes

User-managed notebooks can now be started in collaborative mode.

Issue ticket number and link

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [ ] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings
• [ ] If it is a core feature, I have added thorough tests.

[codecov-commenter]

Codecov Report

Base: 72.01% // Head: 71.97% // Decreases project coverage by -0.03% :warning:

Coverage data is based on head (81a4970) compared to base (c160c39). Patch coverage: 50.00% of modified lines in pull request are covered.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #51 +/- ## ========================================== - Coverage 72.01% 71.97% -0.04% ========================================== Files 55 55 Lines 2562 2566 +4 ========================================== + Hits 1845 1847 +2 - Misses 717 719 +2 ``` | [Impacted Files](https://codecov.io/gh/avast/wanna-ml/pull/51?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast) | Coverage Δ | | |---|---|---| | [src/wanna/core/services/notebook.py](https://codecov.io/gh/avast/wanna-ml/pull/51/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast#diff-c3JjL3dhbm5hL2NvcmUvc2VydmljZXMvbm90ZWJvb2sucHk=) | `59.01% <33.33%> (-0.43%)` | :arrow_down: | | [src/wanna/core/models/notebook.py](https://codecov.io/gh/avast/wanna-ml/pull/51/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast#diff-c3JjL3dhbm5hL2NvcmUvbW9kZWxzL25vdGVib29rLnB5) | `100.00% <100.00%> (ø)` | | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=avast)

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