feat: multiple transactions for relay quote

[matthewwalsh0]

Explanation

Support Relay quotes requiring multiple transactions, such as a token approval and deposit.

Use fallback gas limit if missing in transaction data.

References

Related to #6184

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 communicated my changes to consumers by updating changelogs for packages I've changed, highlighting breaking changes as necessary
• I've prepared draft pull requests for clients and consumer packages to resolve any breaking changes

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Note

Adds multi-transaction support for Relay quotes, including batched submission, fallback gas handling, and improved fee calculation.

• Relay strategy:
  • Execute quotes with multiple transactions; submit via TransactionController:addTransactionBatch (first tx marked tokenMethodApprove).
  • Use fallback gas limit (RELAY_FALLBACK_GAS_LIMIT = 900000) when gas is missing; normalize params accordingly.
  • Calculate source network fees by summing gas across items; fallback per-item gas when absent.
  • Poll Relay status from the last step to completion; handle failure/refund.
• Utils:
  • Add collectTransactionIds in src/utils/transaction.ts to track created tx IDs; used by Relay and Bridge flows.
• Bridge strategy:
  • Use collectTransactionIds and wait for confirmations before bridge completion checks.
• Types:
  • Make Relay step data.gas optional.
• Tests/Mocks:
  • Add tests for multi-transaction, gas fallback, fee aggregation; extend messenger mock with addTransactionBatch.
• Changelog:
  • Note added support for Relay quotes with multiple transactions.

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[cursor]

Bug: Gas Estimates: Partial View, Full Cost.

The gas calculation only considers the first step via quote.steps[0].items but relay-submit.ts submits all steps via quote.steps.flatMap((s) => s.items). This inconsistency causes incorrect gas cost estimates when quotes have multiple steps, as only the first step's transactions are included in the total gas limit calculation while all steps are actually executed.