Support CRM contacts and organizations in subgroups and out of hierarchy

app/controllers/groups/application_controller.rb

app/controllers/groups/crm/contacts_controller.rb

app/controllers/groups/crm/organizations_controller.rb

app/finders/crm/contacts_finder.rb

app/models/customer_relations/contact.rb

app/models/customer_relations/issue_contact.rb

app/models/customer_relations/organization.rb

app/models/group.rb

app/models/group/crm_settings.rb

app/models/project.rb

app/policies/issue_policy.rb

app/services/issues/set_crm_contacts_service.rb

app/services/work_items/callbacks/crm_contacts.rb

lib/gitlab/quick_actions/issue_actions.rb

lib/sidebars/groups/menus/customer_relations_menu.rb

locale/gitlab.pot

spec/finders/crm/contacts_finder_spec.rb

spec/models/customer_relations/contact_spec.rb

spec/models/customer_relations/issue_contact_spec.rb

spec/models/customer_relations/organization_spec.rb