feat(transaction-pay-controller): validate Relay quotes

[matthewwalsh0]

Explanation

Transaction Pay currently accepts Relay quotes after construction without validating that the resulting execution path is still executable. That can leave clients with quotes that only fail later during submission or transaction simulation.

This PR adds post-quote Relay validation through the existing checkQuoteSupport strategy hook. Relay converts each quote into normalized execution transactions, then generic validation checks source balance, decoded source-token transfers, and execution simulation before quotes are persisted as executable.

The simulation and validation logic is split into generic utilities so other strategies can opt into the same checks when they can provide normalized transaction calls. Sentinel simulation remains the primary path, with single-transaction RPC fallback through debug_traceCall and eth_estimateGas; strategies can request a simulation-only 7702 account mock via mock7702From without knowing the state-override details.

References

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
• I've introduced breaking changes in this PR and have prepared draft pull requests for clients and consumer packages to resolve them