Add `Select::onChange()` method

[vjik]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	❌

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (d073b0e) to head (fcdffd7). Report is 2 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #229 +/- ## =========================================== Coverage 100.00% 100.00% - Complexity 806 807 +1 =========================================== Files 86 86 Lines 2213 2217 +4 =========================================== + Hits 2213 2217 +4 ```

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