[eslint-plugin-vtex] Create rule to prevent assigning the return value of array methods that mutate the array

[kaisermann]

Is your feature request related to a problem? Please describe.

As posted on slack:

Jay Phelps @_jayphelps
I feel very strongly that array.sort() in JS should 100% of the time be put on it's own line and return value never used. sort() mutates the original array, and returns that same array again, so when chained with functional methods like map/filter/reduce is very bug prone later https://pbs.twimg.com/media/EJnuzRGXkAIPCvB.png

Describe the solution you'd like

Reference: https://github.com/cartant/eslint-plugin-etc/blob/master/source/rules/no-assign-mutated-array.ts

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