Make readonly arrays accepted by cx()

[garronej]

I changed the type definitions of ArrayClassNamesArg that defines what the cx() function can accept as argument.

Because:

cx is pure, the array passed will never be edited.

Using ReadonlyArray instead or Array

Checklist:

• Documentation N/A
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• Code complete
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Thank you for your amazing work.

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[garronej]

up?

[Andarist]

This one has already been changed in #2057 but I lost track of this PR. I've revived it here: #2295 . Unfortunately, it's failing our type tests right now - I need to investigate it. If you help out with this - I would highly appreciate it.