depends on:

* [x] ipld/js-dag-ucan#97

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Copy-pasted some example code in the UCAN workshop. This fix made it work: the invocations are each individual arguments, not an array.

Wondering though if the array form would be more intuitive when batching multiple invocations - in the old docs it would be `connection.execute(invocations)`, in the working code it's `connection.execute(...invocations)`.

If proofs contain an attestation that is not issued by the service authority then `claim(...)` will recurse indefinitely.

This PR implements #268 

Specifically, we are changing the `did:web:web3.storage` service DID to `did:web:up.storacha.network` and want to allow attestations issued by `did:web:web3.storage` to still be considered valid.

resolves #268 
closes #267

This PR adds a new server option `audience`, which allows the server to accept invocations for audiences other than the service itself.

This option was already available (and continues to be available) on a per handler basis (via `provideAdvanced`), it takes precedence over the new global server audience.

Concretely, the DID for web3.storage is changing, but we want to be able to accept invocations targeting the old DID without having to configure every single handler.

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