Add supabase connection

[thetiagogil]

This PR adds supabase connection.

• Installed supabase library and added supabase connection via supabase.ts file;
• Added users table to supabase (with the model src/models/user.model.ts);
• Added useUserApi.ts file to handle connections with users table in supabase (currently only has getUserById);
• Added auth.context.tsx file to handle login and logout and to keep track of userId, isAuthenticated and hasAvatar states (this context is currently sending the whole user model to the localStorage. this may need to be updated in the future for security);
• Installed toastify library to improve UI communication.
• Added loading page that waits for context data to be fetched before rendering.

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