[php-slim4] Setup token authentication middleware

Created by: ybelenko

Spent almost two weeks on this PR. Hope somebody will find it useful. I have to significantly update my own fork of Slim token middleware package. Now it supports PHP 7.4 || 8.x and also contains middleware factory class required for PHP-DI container. I've added classname prop to CodegenSecurity since I need security component name(camelcased) in mustaches to build user security implementations.

Checked build locally with PHP 8.1.6. Works as expected.

@wing328 if you know how to add classname prop to HashMap templates without modifying CodegenSecurity class - let me know.

cc @jebentier @dkarlovi @mandrean @jfastnacht @renepardon

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