Prepared SQL sniff: support array_map()

[Chouby]

Hi,

intval is accepted as an SQL escaping function but it is most often used together with array_map.
In WPCS 0.12.0, the query at https://github.com/WordPress/WordPress/blob/4.8/wp-includes/taxonomy.php#L3330 gives the error:
Use placeholders and $wpdb->prepare(); found array_map

[JDGrimes]

I thought that at one point this might have been supported, but I just checked against 0.10.0 and 0.11.0 and both also give the error. So this is apparently not a regression.

Edit: I guess I was thinking of the XSS sniff, which does support array_map().

Related: #843, which would introduce some helper code that the sniff could probably use to handle this kind of checks better.

[JDGrimes]

Note that the implode() part should already be handled correctly, see #515.