Support language injection in a PHP NOWDOC/HEREDOC

[spawnia]

Hey, thanks for this great plugin.

PHP has a special syntax for multiline strings that allows tagging the string. This tag is often to denote the contents of the string and add syntax highlighting: https://www.jetbrains.com/help/phpstorm/using-language-injections.html#inject-language-nowdoc-heredoc

I propose adding the tag GRAPHQL to the list of supported NOWDOC/HEREDOC tags.

[juangcCM]

Any update about this?

[leoarnold]

Great idea! Also, Ruby please: