Fix Map, Enumerate and Zip in comprehension list

[smhah]

• Modify line 194 {(if rank == 0)...} to not assert error if shape == (), to consider it as None because of a runtime error.

• Fix Enumerate zip map in comprehension list using Iterate class used in normal for loops.

• Work with nested variable in indices variable to prevent conflict with tuple variables and variables used in nested loops.

  • For example if we have expr.indices = [(a,b), c] or expr.indices = [a,(b,c)].
    To fix this conflict I changed indices to a nested list.
    expr.indices = [(a,b), c] => indices = [[a,b], c]].
    But the problem is an error gets raised at the returning of the codeblock in FunctionalFor
    "Basic child cannot be a tuple of tuples"
    So at the end of FunctionalFor I changed the nested list indices variable to a normal list variable.

[github-actions]

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[EmilyBourne]

@smhah what is the status of this PR?