Protect event registration page with CPCHA to avoid SPAM

[c-orazio]

Feature Request

We are using the event tools in project to make payment online : public/eventorganization/attendee_new.php [dolibar 16.0.5]
The problem is that a robot found the link and is submitting fake registration, a CPPCHA would probably avoid the problem.
In addition the form does not ask for the first name and last name, even if the fileds exist in dolibarr...

Use case

No response

Suggested implementation

Add a capcha to avoid robot registration
Add two filed in the form for first name and last name.

Suggested steps

No response