Added comma for index + step in slice #102
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This is my proposition to add comma in index such as in$..books[1,2] and step in slice such as in $ ..books[::-1] or $..books[0:3:2]
for the comma in index, the code is similar to handling of comma in fields. #28
For step in slice, all the code was already there, just needed to implement the rule... ¯_(ツ)_/¯
All tests passed + new ones