Feat/get blocked users

[RonalddMatias]

This PR have:

• Function to get a blocked users.
• Function to block a specific user.

[Francisco-xiq]

LGTM, acho que so falta isso mesmo de liberar essa feature apenas para ADMIN, acredito que vale esperar essa verificação ser feita antes de fazer o merge.
De resto parabens Rona :)

[isaacvicente]

I would just changed the endpoint from blocked_users to just blocked, as the full path would be v1/users/blocked, that would give all users blocked.

The rest LGTM 👍

Nice and thanks.

[isaacvicente]

I will merge it into my branch. Seems that there's a too complex conflict to merge 😢