[Case management] Add new member to a case team

[overeha]

User story:
As a user I want to be able to add specific team members to a case.
Every case will have a case manager ("Manager de caz"). A case may be transferred from one case manager to another. The case manager may add other people to the case team.

Main flow:

1. Go to cases
2. Select a case
3. Click on "Vezi detalii" under "Echipa de caz"
4. Navigate to case team management section (Figma here)
5. Click on Add a specialist
6. Select the name
7. Choose a role.
8. Click on Adauga