[Glitch] Refactor context reducer to TypeScript

Port 17d8e2b6e3 to glitch-soc

Signed-off-by: Claire <claire.github-309c@sitedethib.com>

app/javascript/flavours/glitch/api/statuses.ts

@@ -0,0 +1,5 @@
+import { apiRequestGet } from 'flavours/glitch/api';
+import type { ApiContextJSON } from 'flavours/glitch/api_types/statuses';
+
+export const apiGetContext = (statusId: string) =>
+  apiRequestGet<ApiContextJSON>(`v1/statuses/${statusId}/context`);