Add and configure codespell

[niksirbi]

We are already using codespell on several other repos and it works quite well for catching common misspellings.

[codecov[bot]]

Codecov Report

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

Project coverage is 99.28%. Comparing base (a1afeef) to head (733b0bc). Report is 1 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #143 +/- ## ======================================= Coverage 99.28% 99.28% ======================================= Files 9 9 Lines 556 556 ======================================= Hits 552 552 Misses 4 4 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

See analysis details on SonarCloud

[niksirbi]

Thanks @niksirbi! Nice to see we only have a couple of typos

Well, only few of the ones codespell can catch (common misspellings), but I was also expecting more 😃