Refactor WebP conversion: add cwebp and imagick engines #264

Job	Run time
PHP 8.1 \| WP latest \| highest	2m 39s
PHP 8.1 \| WP latest \| lowest	2m 9s
PHP 8.1 \| WP latest (MS) \| highest	2m 41s
PHP 8.1 \| WP latest (MS) \| lowest	2m 31s
PHP 8.1 \| WP 6.2 \| highest	2m 4s
PHP 8.1 \| WP 6.2 \| lowest	2m 10s
PHP 8.1 \| WP 6.2 (MS) \| highest	2m 54s
PHP 8.1 \| WP 6.2 (MS) \| lowest	2m 41s
PHP 8.2 \| WP latest \| highest	2m 8s
PHP 8.2 \| WP latest \| lowest	2m 11s
PHP 8.2 \| WP latest (MS) \| highest	2m 32s
PHP 8.2 \| WP latest (MS) \| lowest	2m 36s
PHP 8.2 \| WP 6.2 \| highest	2m 13s
PHP 8.2 \| WP 6.2 \| lowest	2m 9s
PHP 8.2 \| WP 6.2 (MS) \| highest	2m 40s
PHP 8.2 \| WP 6.2 (MS) \| lowest	2m 47s
PHP 8.2 \| WP trunk \| highest	2m 17s
PHP 8.3 \| WP trunk \| highest	2m 13s
PHP 8.1 (Imagick) \| WP latest \| highest	2m 16s
PHP 8.1 (with coverage) \| WP latest \| highest	2m 20s
	48m 11s

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