Improve VAR parsing for arrays

[gustason]

For example, in the code

VAR INT[4] myArray = [10,11,12,13].

it would be nice if [4] would get parsed as an array_literal.

[eglekaz]

@gustason could you please give a bit more insight on why it is needed?
As I can see in the documentation, it is just an indication that variable is array, not array itself. And it must be an integer.
So having number_literal in brackets does not look wrong.

[gustason]

When we have an array access statement (for example, myArray[4]), the [4] part gets parsed as an array_literal. In the case of a var statement, it would be helpful if it behaved similarly. This would treat both the brackets and the numbers inside them as a single entity, and the same formatting that's currently already implemented would work on both.