feat: define swap QuoteResponse V2 schema validators

[micaelae]

Explanation

Implements schema definitions and validators based on this ADR: https://github.com/MetaMask/decisions/blob/main/decisions/trading/0057-swap-bridge-quote-metadata-migration.md

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

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Note

Medium Risk
Introduces new quote/asset validation contracts for swap-bridge migration without switching the live fetch path yet; export relocation of BridgeAsset may affect consumers that imported it from types.

Overview
Adds superstruct schemas and validateQuoteResponse for the ADR-aligned QuoteResponse V2 shape, alongside existing V1 (validateQuoteResponseV1 / QuoteResponseV1 exports are unchanged for controller state and fetch).

V2 quotes use AmountsAndAsset for src/dest and fee line items, QuoteSchemaV2 (nested priceData, array-based feeData, required protocols), and StepSchemaV2. BridgeAssetV2 / MinimalAsset add CAIP-centric assets with optional security metadata; legacy BridgeAsset moves to validators/bridge-asset.js and is marked deprecated.

Package exports now include validateQuoteResponse, validateBridgeAssetV2, and related schemas/types. Internal imports were updated to pull BridgeAsset from the validator module. Test fixtures use lowercase EVM addresses; Stellar CAIP formatting no longer special-cases testnet in formatChainIdToCaip.

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