Refactor/contracts status guard helper

[Glam26]

1. The new guard_status_eq and guard_status_in helpers and the updated
   status code legend in lib.rs .
2. The complete rollout of the new status guards across all InvoiceEscrow
   entrypoints replacing the manual status == N checks.
3. The fixed init function calls across all tests (aligning them to match
   the new 14-argument signature).
4. The deletion of the legacy attestation and revocation test cases from
   attestations.rs .
5. The various bug fixes to syntax, duplication, and imports.

closes #486

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[mikewheeleer]

looks good — merging now