Refactoring: Extract HttpParameters class from Endpoint

1. Немного упростил `Lurker::Endpoint::ResponseCodes`
2. Упростил `Lurker::Endpoint`
3. Выделил `Lurker::Endpoint::HttpParameters`,  `Lurker::Utils`
Prefer `inject` over `reduce`.<br>Use `each_with_object` instead of `reduce`.