Add errors to protofsm.MsgEndpoint methods

[GeorgeTsagk]

This PR adds an extra error return field to the MsgEndpoint interface methods

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[Roasbeef]

Why does CanHandle need an error? The implementation should just be doing a type assertion on the message to decide if it can handle it or not.

[Roasbeef]

Would say the same for SendMessage above, can you give more detail re the motivating context here?

[GeorgeTsagk]

Yeah, the interface was changed to support returning an error, as this was required in tapd in order to allow for the server readiness check to fail
https://github.com/lightninglabs/taproot-assets/pull/1126/files#diff-366e46a40f6f60b4f7614eb0976bb51820364bf5ca6ccc4787eb49d7bdbef3e6R827-R845

[lightninglabs-deploy]

@guggero: review reminder
@GeorgeTsagk, remember to re-request review from reviewers when ready

[GeorgeTsagk]

This is no longer needed for lightninglabs/taproot-assets#1126

Closing