Add tRPC, use it for group expenses, balances and information page (#246)

* Add tRPC, use it for group expense list

* Use tRPC for balances

* Use tRPC in group information + better loading states

src/trpc/routers/groups/index.ts

@@ -0,0 +1,10 @@
+import { createTRPCRouter } from '@/trpc/init'
+import { groupBalancesRouter } from '@/trpc/routers/groups/balances'
+import { groupExpensesRouter } from '@/trpc/routers/groups/expenses'
+import { groupInformationRouter } from '@/trpc/routers/groups/information'
+
+export const groupsRouter = createTRPCRouter({
+  expenses: groupExpensesRouter,
+  balances: groupBalancesRouter,
+  information: groupInformationRouter,
+})