REPO-317: [EQP] Add insecure functions sniff with severity 10 for M1 packages

[slitviachenko]

• created a new InsecureFunction sniff identical to the corresponding M2 sniff

[roerlemans]

Why can't we use serialize and unserialize? Magento1 core is full with these functions. Would be better if we are allowed to use those 2 Methods.

Samen with mt_rand, random_int isn't a good alternative for that. It's a PHP7 function.