Custom class names, akka-http: Custom Directive injection, akka-http: text/plain responses in servers

Big update, thanks to those who contributed!

Included issues:

guardrail-dev/guardrail#713 fix: fallback to string type for unsupported format types
guardrail-dev/guardrail#719 fix guardrail-dev/guardrail#314: Allow custom class names for generated clients and server resources/handlers
guardrail-dev/guardrail#747 Akka HTTP: Add option to extract arbitrary data from request and pass to handler
guardrail-dev/guardrail#756 Fix custom classname tests
guardrail-dev/guardrail#763 Actually fix DW resource optional collection param unwrapping
guardrail-dev/guardrail#777 fix Java 'equals' method
guardrail-dev/guardrail#779 Support text/plain in akka-http server responses

Support:

Updates:

guardrail-dev/guardrail#744 Update akka-http, akka-http-testkit to 10.2.0
guardrail-dev/guardrail#754 Update hibernate-validator to 6.1.5.Final
guardrail-dev/guardrail#758 Update mockito-scala, ... to 1.15.0
guardrail-dev/guardrail#760 Update scalameta, semanticdb-scalac to 4.3.21
guardrail-dev/guardrail#761 Update dropwizard-core, dropwizard-forms, ... to 1.3.25
guardrail-dev/guardrail#765 Update sbt-scalafix to 0.9.20
guardrail-dev/guardrail#770 Update cats-effect to 2.2.0
guardrail-dev/guardrail#773 Update autofix to 3.1.0.1

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