BHoM_Adapter: request refactor RECAP

[alelom]

Description:

Many small things need to be done around the Requests that together make some refactoring needed.

• https://github.com/BHoM/BHoM_UI/issues/228
• https://github.com/BHoM/BHoM_Adapter/issues/227
• https://github.com/BHoM/BHoM_Adapter/issues/239
• https://github.com/BHoM/BHoM_Adapter/issues/247
• https://github.com/BHoM/BHoM_Adapter/issues/241