Feat: signed sessions

[gabrielcipriano]

A proposal for signed endpoints, so we have "authentication" at request level

using it on client side example:

import { useCommune } from "@commune-ts/providers/use-commune";
import { signData, createSessionData} from "@commune-ts/api";

const { signHex } = useCommune();

const useStartSession = api.auth.startSession.useMutation();

const handleStartSession = async () => {
  const sessionData = createSessionData(window);
  const signedData = signData(signHex, sessionData);

  const result = await useStartSession.mutateAsync(signedData);

  console.log("token: ", result.token);
  console.log("authenticationType: ", result.authenticationType); // Bearer

  const authorization = `${result.authenticationType} ${result.token}`; // "Bearer <token>"

  // Set the token as authorization header
  // ...
}

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[EdSDR]

This will be closed since front end integration PR has all the contents of this branch