[EPIC] Group activity entries by visits

[AnthonyLaiRH]

We misunderstood how the client operates and made our charges linked to individual activity entries, we need a new way to group activities together and charge all activities in the group at once

• Propose new changed design #362
• Design and verify the new user interface #374

Implementation:

• Implement visit CRUD services #375
• Implement visit UI
• Implement UX enhancement business logics