Allow to create a contract on an organization during its creation

[marien-probesys]

Problem

When creating an organization, the user is redirected to the list of organizations. If they want to finish to configure it with a contract, it's annoying to:

• search for the organization
• click on the organization
• click on "contracts"
• click on "new contract"

This workflow could result in an organization not being correctly configured.

Solution

When creating an organization, if the user can create contracts in it, redirect them to the "new contract" form.

Specifications

In App\Controller\OrganizationsController::new, once the organization is saved:

// with $authorizer being a \App\Security\Authorizer
if ($authorizer->isGranted(`orga:manage:contracts`, $organization)) {
    // redirect to 'new organization contract'
} else {
    // redirect to 'organizations'
}