Run PHP CodeSniffer in parallel mode

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Run PHP CodeSniffer in parallel mode

PHP CodeSniffer has a parallel mode which can be used to speed up the time it takes to run the suite, this can be especially useful in larger projects where we checking hundreds of files.

The process is largely undocumented hence this open issue: squizlabs/PHP_CodeSniffer#1732

Reason for proposed change

• Decrease the time it takes to run phpcs/phpcbf
• Speed up CI processes

cameronbryers@westpac-web:/var/www/html$ composer phpcs
> bespoke-phpcs
............................................................  60 / 512 (12%)
............................................................ 120 / 512 (23%)
............................................................ 180 / 512 (35%)
............................................................ 240 / 512 (47%)
............................................................ 300 / 512 (59%)
............................................................ 360 / 512 (70%)
............................................................ 420 / 512 (82%)
............................................................ 480 / 512 (94%)
................................                             512 / 512 (100%)


Time: 13.26 secs; Memory: 54MB

cameronbryers@westpac-web:/var/www/html$ composer phpcs -- --parallel=8
> bespoke-phpcs '--parallel=8'
........ 8 / 8 (100%)


Time: 2.64 secs; Memory: 6MB

cameronbryers@westpac-web:/var/www/html$ composer phpcs -- --parallel=16
> bespoke-phpcs '--parallel=16'
................ 16 / 16 (100%)


Time: 3.1 secs; Memory: 6MB