feat(core-shared): add tRPC init with superjson

packages/core-shared/src/trpc/init.ts

@@ -0,0 +1,10 @@
+import { initTRPC } from "@trpc/server";
+import superjson from "superjson";
+
+const t = initTRPC.create({
+  transformer: superjson,
+});
+
+export const router = t.router;
+export const publicProcedure = t.procedure;
+export const middleware = t.middleware;