Add company-scoped brand and company settings API.

brand now carries a NOT NULL company_id (unique per (company_id, name))
with brand.list/upsert/delete backed by resolveCompanyAccess. Adds
companysetting key-value store (list/get/set/delete, frontend flag).

src/store/companysetting/shapeSetting.js

@@ -0,0 +1,9 @@
+function shapeSetting(row) {
+  return {
+    key: row.key,
+    value: row.value,
+    frontend: Boolean(row.frontend),
+  };
+}
+
+export default shapeSetting;