Tweak the wrapValue function to allow for array column operations

This is probably *not* the general-purpose solution to the problem I'm encountering, but it solves my issues. I need to do a join on table.array_column[1] = value, but the existing wrapValue process turns that into "table"."array_column[1]" instead of "table"."array_column"[1]. This seemed like the best place to find that case and fix it.

In where clauses, I could do a whereRaw to brute-force the double-quotes, but there doesn't seem to be a similar functionality in join clauses. That would be another way to solve this problem, though - allow for a join(this.raw("stuff")) (which currently throws a toLowerCase error when compileJoins tries to lowercasify the Raw.