Add a notebook with an example of MeasuredNoiseGP

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (8355c4c) 95.63% compared to head (c5e2aed) 95.98%. Report is 13 commits behind head on main.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #71 +/- ## ========================================== + Coverage 95.63% 95.98% +0.35% ========================================== Files 51 51 Lines 3918 4063 +145 ========================================== + Hits 3747 3900 +153 + Misses 171 163 -8 ``` | [Flag](https://app.codecov.io/gh/ziatdinovmax/gpax/pull/71/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Maxim+Ziatdinov) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/ziatdinovmax/gpax/pull/71/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Maxim+Ziatdinov) | `95.98% <ø> (+0.35%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Maxim+Ziatdinov#carryforward-flags-in-the-pull-request-comment) to find out more.

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