Optimize array_contains functions

[Pieter12345]

Improve runtime performance on array_contains(), array_scontains() and array_contains_ic() by iterating over the array values whenever possible, rather than creating a keyset to iterate over and calling the getter to get all values.

Running the same code, profiler results (where the profiler started at different points in time) do show a large difference in array_contains().

Before:

After: