Web connectors for Hyper and Data Cloud

[ankoh]

The connectors for Hyper and Salesforce Data Cloud can currently only be used in the native App.

This means that users currently always have to download our Tauri application to execute SQL queries. This is restricting the general "click a link, and see the query result in 5s"-flow to power-users which is not ideal.

We are currently waiting for Salesforce to implement three things:

1. The OAuth endpoint for the Data Cloud access tokens should respect the orgs CORS settings.
2. Hyper has to support gRPC over Http1, aka grpc-web.
3. This gRPC-web support has to cover CORS for Hyper as well.

We'll use this issue to track progress.