feat(ramps-controller): add unified getOrder to RampsService

[amitabh94]

Explanation

Add a getOrder method to RampsService that calls the V2 unified order endpoint (GET /v2/providers/:providerCode/orders/:orderCode). This endpoint returns a normalized RampsOrder (DepositOrder shape) for all provider types, enabling mobile to use a single order processor instead of separate aggregator and deposit processors.

This is the core-side prerequisite for unifying order processing in metamask-mobile and eventually removing both @consensys/on-ramp-sdk and @consensys/native-ramps-sdk for order polling.

Changes

• RampsService.ts: Add RampsOrder type and related types (RampsOrderStatus, RampsOrderNetwork, RampsOrderCryptoCurrency, RampsOrderPaymentMethod). Add getOrder(providerCode, orderCode, wallet) method.
• RampsService-method-action-types.ts: Add RampsServiceGetOrderAction type.
• RampsController.ts: Add getOrder wrapper method. Wire RampsService:getOrder into allowed actions.
• index.ts: Export all new types.

References

• Mobile consumer PR: feat(ramp): add unified order processor behind V2 feature flag metamask-mobile#26084
• V2 API endpoint: GET /v2/providers/:providerCode/orders/:orderCode (already live in onramp-api)

Checklist

• I've updated the test suite for new or updated code as appropriate
• I've updated documentation (JSDoc, Markdown, etc.) for new or updated code as appropriate
• I've highlighted breaking changes using the "BREAKING" category above as appropriate
• I've prepared a draft changelog entry if needed

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