Feature/combine test durations

[joaofogoncalves]

Description

Adding a cli command do combine several test durations files into one single file.
Useful when running parallel jobs in GH actions and after want to combine all changes into a single file.

Checklist

• Tests covering the new functionality have been added
• Documentation has been updated OR the changes are too minor to be documented
• The Changes are listed in the CHANGELOG.md OR the changes are insignificant

[jerry-git]

Great, thank you! Could you add some test(s) and make the CI green.

[joaofogoncalves]

Great, thank you! Could you add some test(s) and make the CI green.

I Added tests and fixed the failing pre-commit checks.

[eiriklid]

@jerry-git is this something I can help out with?
Would like to have this feature as well.

[christophehenry]

Same here, this would be awesome. @jerry-git This PR has ben openened for more than a year, now. If you don't want to maintain it anymore — which is totally understandable — would you consider transfer to repo to another organisation?