parser: add support for multidimensional arrays

[gabrielhnf]

Implements parsing support for multidimensional array access (a[1][2][3])

[Alonely0]

It's perfect. Tysm! Could you add some tests? Should be quick with the macro; take the other parser tests for reference.

[gabrielhnf]

Noticed while adding tests that left unary place operators were parsing only one dimensional arrays (++a[1][2] became (++a[1])[2]), so I had to tweak fn parse_place as well to handle multidimensional arrays, let me know if you prefer a different approach or any more tests.

[Alonely0]

Good catch with the increment/decrement operators, and overall great job. I got nothing else to add, so we can merge right away. Ty!