Create a session

[nichoth]

For testing purposes, we need an instance of wnfs. Things like username and keys don't matter so much here.

I learned you must call await program.auth.register({ username }) before we get a session via await program.auth.session().

    const program = await wn.program({
        namespace: APP_INFO
    })
    const { crypto } = program.components
    const username = await createUsername(await createDID(crypto))

    // *must* call `register` before we use the `session`
    await program.auth.register({ username })

    const session = program.session ?? await program.auth.session()