Serializers, Deserializers and custom Response

[dalechyn]

There is an awesome helper hc to be used on client side to fetch routes and get typed responses (https://hono.dev/docs/guides/rpc#client).

However, if your API endpoints return bigints, typed responses won't work since bigint is not serializable.

I suggest to add transformer property to Hono instance that would work similarly to how it works in trpc (https://trpc.io/docs/server/data-transformers).

This would let stringifying data with c.json response.

Since hono simply provides typed Response.json(), hc helper would need to pass a modified instance of Response that would have a function defined to deserialize the payload with the same transformer. It probably could override json() method to accept an argument json({ useTransformer: true }) to use transformer to deserialize payload.