[To discuss] Network - Forms - Sort dropdown options in a custom way

[carlabiscotti]

As an admin user, I want to define a custom way to sort out the list of options available in a field, so that the most relevant appear first.

Acceptance criteria:

• There is a way for admin users to set a custom order for sorting out the options in a field with different options.
• The priority is to have this option for the "Organization type" and "Main thematic" fields in the Organizations form. Although, ideally, this should be available for all fields. This decision depends on the level of effort required.
• If sorting in a custom way is complex to implement, sorting them alphabetically and placing the option "Other" at the end would be sufficient.

[EmilieVrot]

Linked to #149 and #124

If it is too complicated, we can keep an alphabetical order, just having "Others" at the end, at least in FO.

[EmilieVrot]

JIRA #ORC-400