Refactor web_push_subscription (#6047)

* Remove onSave method in mapped properties for column_settings

* Make web_push_subscription.register an action

app/javascript/mastodon/actions/push_notifications/setter.js

@@ -0,0 +1,34 @@
+export const SET_BROWSER_SUPPORT = 'PUSH_NOTIFICATIONS_SET_BROWSER_SUPPORT';
+export const SET_SUBSCRIPTION = 'PUSH_NOTIFICATIONS_SET_SUBSCRIPTION';
+export const CLEAR_SUBSCRIPTION = 'PUSH_NOTIFICATIONS_CLEAR_SUBSCRIPTION';
+export const SET_ALERTS = 'PUSH_NOTIFICATIONS_SET_ALERTS';
+
+export function setBrowserSupport (value) {
+  return {
+    type: SET_BROWSER_SUPPORT,
+    value,
+  };
+}
+
+export function setSubscription (subscription) {
+  return {
+    type: SET_SUBSCRIPTION,
+    subscription,
+  };
+}
+
+export function clearSubscription () {
+  return {
+    type: CLEAR_SUBSCRIPTION,
+  };
+}
+
+export function setAlerts (key, value) {
+  return dispatch => {
+    dispatch({
+      type: SET_ALERTS,
+      key,
+      value,
+    });
+  };
+}