Make Input TEEKit-compatible

[rjwebb]

Get Input running in a Gramine SGX enclave.

Implementation

This involves making changes in three areas: the TEEKit "build" tooling, the Input backend and the Input frontend.

TEEKit "build" tooling

Changes to the build tooling need to happen in two packages: kettle and kettle-sgx.

• Update kettle so that we can build Kettle apps (i.e. the bundle consisting of app.js and worker.js) outside of the teekit repo (i.e. we can import @teekit/kettle and then run commands with the kettle CLI).
• Update kettle-sgx so that we can use it to package apps (built by kettle) outside of the teekit repo.

Input backend

• Replace node's http library with Hono
• Import TunnelServer from @teekit/tunnel
• Call TunnelServer.initialize when the app starts
• Export the /quote port so that we can collect the TEE attestation

Input frontend

• Import TunnelServer from @teekit/tunnel from the app
• Call TunnelClient.initialize with the backend URL and expected TEE attestation as arguments, to initiate the connection with the server
• For requests that go to the server, use the fetch function provided by the tunnel client