[6.x] Add array-style config support for sanitizers

[riasvdv]

Array Config Files

Named sanitizers can also be registered with Symfony-style array config files in config/craft/sanitizers/. The file name becomes the sanitizer name.

<?php

// config/craft/sanitizers/no-headings.php
return [
    'allow_safe_elements' => true,
    'block_elements' => ['h1'],
];

Use it like any other named sanitizer:

{{ body|sanitize('no-headings') }}

[semanticdiff-com]

Review changes with  

[linear-code]

PT-3109 Add array-style config support for sanitizers