Alternative syntax for AQL array iteration #20375
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* Introduce alternative syntax for AQL array iteration using FOR loop:
* `FOR [value] IN expression`: identical to `FOR value IN expression`, but
more clearly indicates that they iteration is over an array of values.
* FOR [idx, value] IN expression`: populates an additional output variable
(`idx` in this case) with the row number, starting at 0.
Both syntaxes cannot be used to iterate directly over collections or view,
i.e. the input expression cannot be a collection or a view.
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Scope & Purpose
FOR [value] IN expression: identical toFOR value IN expression, but more clearly indicates that they iteration is over an array of values.: populates an additional output variable (idx` in this case) with the row number, starting at 0. Both syntaxes cannot be used to iterate directly over collections or view, i.e. the input expression cannot be a collection or a view.Checklist
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