refactor(auth): full rewrite of AuthService

[dalbitresb12]

What does it do

This PR is a full refactor of the AuthService so that it uses the HttpClient with fake logins from the mock API.

• Move common service logic to BaseService
• Implement HttpClient
• Use the service in auth pages
• Manage global state for the User

Usage

Add the AuthService wherever you need it to your constructor:

import { Component } from "@angular/core";
import { AuthService } from "../auth/services/auth.service";

@Component({
  selector: "app-sample",
  templateUrl: "./sample.component.html",
  styleUrls: ["./sample.component.css"],
})
export class SampleComponent {
  constructor(private authService: AuthService) {}
}

If you just need access to the User global state, please use the UseUser hook provided in src/app/auth/hooks/use-user.ts. You can see sample implementation of this hook in the Profile and SignIn component.

This pull request also provided the initial implementation of the generic BaseService, which will be used for any new services implemented in the app. It provided generic implementation of CRUD operations for basic services, with the ability to create custom logic on each service with those base operations. You can see sample implementations of this on AuthService and ProjectsService.

Why is it needed

We'll use fake logins currently, but once the backend is fully implemented, we'll just switch to that.

Related issue(s)/PR(s)

Initial implementation: #6.

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[AdrianAlzamoraG]

Reviewed changes

[VivianMPQ]

reviewed changes