fix: use graphql directly

[wa0x6e]

🧿 Current issues / What's wrong ?

Hub queries are send via snapshot.js SDK, using the snapshot.utils.subgraphRequest function. While this function is quite practical, it does have limit, and is not adapted when the hub database is part of the core function.

We can not customize the fetch request.
We should query the hub using apollo, like on envelop and sidekick

💊 Fixes / Solution

Fix #97
Fix SNAPSHOT-WEBHOOK-7

🚧 Changes

• Migrate the hub querying to use apollo graphql directly, allowing more control on the fetch request.
• Use a keep-alive connection while connecting to the hub

🛠️ Tests

• run yarn dev it should run and process events

[ChaituVR]

@wa0x6e Could you resolve conflicts 🙈 i missed it last time

[wa0x6e]

@wa0x6e Could you resolve conflicts 🙈 i missed it last time

done

[ChaituVR]

We are not using json-to-graphql-query anymore? can we remove it from package.json

[wa0x6e]

We are not using json-to-graphql-query anymore? can we remove it from package.json

done

[sentry-io]

Sentry issue: SNAPSHOT-WEBHOOK-S