Manage additional service quantity

[cbellone]

This PR:

• allows organizers to set a maximum quantity to additional items
• allows to distribute additional items among tickets at purchase time
• fixes Donation is shown even when sale start in the future.  #1305
• fixes When Ticket categories are growing dynamically, the additional option is not functioning as aspected. #1286

[syjer]

UI related improvement:

During the ticket selection flow:

• better signaling about the additional options (add a title for the section "Selected additional options"? )
• display description, as only the title may not be enough

During visualization of the ticket:

• pdf should have the attached additional option
• html view should also have (it's visible during the edit, but not on the list view and on the single view)
• email (?)

Bug/issue:

In the admin, during the edit of an additional option:

java.lang.IllegalArgumentException: Cannot reduce available items to -1

When simply trying to change the name of:

[sonarcloud]

Quality Gate passed

The SonarCloud Quality Gate passed, but some issues were introduced.

5 New issues
0 Security Hotspots
75.4% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud