types: fix support for defaultNS as array (fixes #2118)

[marcalexiei]

Fixes #2118.

The main difference from #2119 is that I tried to take into account all namespaces included in defaultNS when providing it as an array.

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Before marking this PR ready for review I would like to see what I can do to deduce test code.
I hope to have something ready tomorrow.

Checklist

• only relevant code is changed (make a diff before you submit the PR)
• run tests npm run test
• tests are included
• commit message and code follows the Developer's Certification of Origin

Checklist (for documentation change)

• only relevant documentation part is changed (make a diff before you submit the PR)
• motivation/reason is provided
• commit message and code follows the Developer's Certification of Origin

[coveralls]

coverage: 96.239%. remained the same
when pulling 79771d8 on marcalexiei:feature/default-ns-as-array
into 44e132d on i18next:master.

[marcalexiei]

@adrai I don't know why circleci chec is performed again. For example in PR #2112 the check wasn't present.
I don't think this is issue an issue but just wait to point out this strange behaviour.

[adrai]

I think we can ignore the circleci check here... should not be related to this pr

[marcalexiei]

@adrai PR is ready for review!

[adrai]

thank you, it's included in v23.7.17