Feature/JA-114 Blazor components configuration

[Zjyslav]

They are actually Razor components, but it's not important.

I configured the minimum we will need to use components with all available render modes (server or WASM, prerendered or not).

We should put all components in TutorLizard.Blazor.Components, unless we really need them to be run in Server mode and have access to other assemblies (most likely won't happen), then we'll put them in TutorLizard.Web.Components.

To use a Razor component in a .cshtml view, all we need is this snippet:

<component type="typeof(OurComponent)" render-mode="WebAssemblyPrerendered"/>

[Zjyslav]

I added a new project: TutorLizard.Shared where I moved all our DTOs and Enums (the ones that were in TutorLizard.BusinessLogic.Enums).
Since this project doesn't have a reference to the BL, we cannot use our DB models, so I removed some unused DTOs that referenced them and modified the ones that were used to ask only for specific values.
Then, I renamed some methods in services and the requests/response DTOs, so now they have consistent names (not necessarily better, but consistent).

I also wanted to do a small refactoring of DTOs used for logging in and user registration, but I worry it might cause too much conflicts for OAUTH that's not merged yet. I'll get to it, eventually.