feat(perps): add id to funding payment records

[kartojal]

Add a required id (PerpsFundingPaymentId NewType) to PerpsFundingPayment, covering both funding history and the realtime funding stream. (DEV-451)

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Note

Medium Risk
The PerpsFundingPayment schema change is breaking for callers or fixtures missing id, though it matches the API and stays within experimental perps models.

Overview
Adds a required id on PerpsFundingPayment, typed as the new PerpsFundingPaymentId NewType, and re-exports that type from the perps and top-level model packages.

Funding history from list_funding_payments and realtime PerpsFundingEvent session frames now parse and surface the server record id (including compact wire keys in tests). Unit coverage was extended for REST pagination, model alias parsing, and the funding channel event payload.

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