feat: Added ability to disable sharing at collection (#1875)

* feat: Added ability to disable sharing at collection

* fix: Disable all previous share links when disabling collection share
Language

* fix: Disable document sharing for read-only collection members

* wip

* test

* fix: Clear policies after updating sharing settings

* chore: Less ambiguous language

* feat: Allow setting sharing choice on collection creation

server/migrations/20210208062816-disable-collection-sharing.js

@@ -0,0 +1,12 @@
+module.exports = {
+  up: async (queryInterface, Sequelize) => {
+    await queryInterface.addColumn('collections', 'sharing', {
+      type: Sequelize.BOOLEAN,
+      allowNull: false,
+      defaultValue: true
+    });
+  },
+  down: async (queryInterface, Sequelize) => {
+    await queryInterface.removeColumn('collections', 'sharing');
+  }
+}