feat(admin-shared,dashboard,js-sdk,types): refund reasons in dashboard (#13575)

CLOSES CORE-1209

This PR just adds the stuff necessary to support refund reasons in the dashboard. It adds the option in the settings tab and allows viewing, creating, editing and deleting refund reasons. I hate to open such a big PR but most of it is copy pasted from the return reasons. Major difference is only the fact that refund reasons don't have a `value` field

packages/modules/payment/src/models/refund-reason.ts

@@ -4,7 +4,7 @@ import Refund from "./refund"
 const RefundReason = model.define("RefundReason", {
   id: model.id({ prefix: "refr" }).primaryKey(),
   label: model.text().searchable(),
-  description: model.text().nullable(),
+  description: model.text().searchable().nullable(),
   metadata: model.json().nullable(),
   refunds: model.hasMany(() => Refund, {
     mappedBy: "refund_reason",