Refactoring most of the project

[ruslanbaidan]

The code refactoring includes the following parts:

• Removed the relying on the abstraction and sharing the same methods execution of services.
• Implemented the single responsibility approach to the entities.I
• Added the filtering functionality to process the incoming get requests data and prepare them for the filter and sort queries.
• Added the data validation at first place. Before the post, put, patch and delete requests data are passed to the services, they are validated.
• Removed the dependency on the abstract table common methods, where the entities positions were processed, and some specific code run.
• Implemented the common approach, not resources/time consuming, of the entities positioning based on interfaces and traits.
• Optimised the export and import functionality to be clean and fast.
• Added a common place to validate the analysis access and endpoints permissions before the controllers’ actions are reached. The Middleware passed an anr object to the actions automatically as an attribute.
• Restructured the components and code parts of the application for the based on responsibilities, relations and to be more clear.
• Removed many deprecated code parts and cleaned up the deprecated columns in the DB tables.
• Improved some DB indexes and renamed tables, columns to be more clear on the names.
• Added some first unit tests as a starting point for the full coverage.

Not refactored parts are the following: Questions, QuestionsChoices, Guide, Interviews, ROPA, Deliverable.