Add assert_equal for arrays of strings

[D3usXMachina]

This is needed for e.g. the Protein-Translation exercise featured in 48in24.

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[ErikSchierboom]

I don't know Fortran, but let's just merge this :)

[ErikSchierboom]

Test runner has been updated:https://github.com/exercism/fortran-test-runner/actions/runs/7917383541/job/21613333985