Throttled transport

• Refactoring http client to not be an interface, but rather a client made up of transports with specific functionalities such as request throttling, and status code error checking.
• Refactoring the tests, and removing the need for interface client in package sonarqube.
• Minor refactoring with constants layout to avoid having to use //nolint in sonarqube package.
• Fixing throttling logic.
• Minor refactoring in sonarqube web api interface to improve readability.