feat: implement QuoteResponse V1 and V2 coercers

[micaelae]

Explanation

Implement coercers between QuoteResponse v1 and v2

• toQuoteResponseV2 and toQuoteResponseV1 convert quote responses to required schema when needed
• toQuoteMetadataV2 and toQuoteMetadataV1 convert quote metadata to required schema when needed
• toNormalizedAmountsconverts atomic amounts to display-ready values
  Export sumAmounts helper util for adding up fees or token amounts

References

Implements https://consensyssoftware.atlassian.net/browse/SWAPS-4546

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
Changes quote shape conversion and fee/amount math used in swap/bridge UI; incorrect coercion could show wrong amounts or fees, but scope is bridge-controller with heavy test coverage and no auth/data-store changes.

Overview
Adds bidirectional coercion between bridge QuoteResponse v1 and v2 so clients can migrate without breaking older consumers. toQuoteResponseV2 maps flat v1 fields (srcTokenAmount, srcAsset, bridgeId, etc.) into nested v2 src/dest, array feeData, and protocols/aggregator, including adjusting src amount when tx/metabridge fees apply (unless intent). toQuoteResponseV1 is the deprecated inverse for backwards compatibility.

Metadata is bridged across shapes: toQuoteMetadataV1 / toQuoteMetadataV2 extract or project legacy QuoteMetadata onto v2 partial quotes; toNormalizedAmounts fills normalizedAmount fields from atomic values. mergeQuoteMetadata now branches on v1 vs v2—v1 still lodash-merges legacy fields; v2 merges normalized amounts, v2-shaped metadata, and legacy fields for client testing.

Number helpers: renames calcTokenAmount → calcNormalizedTokenAmount, adds calcAtomicTokenAmount, and exports sumAmounts for aggregating fee/token amounts (same asset for atomic sums). New coercers, metadata helpers, and sumAmounts are exported from the package entrypoint; changelog documents the additions.

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[infiniteflower]

https://github.com/MetaMask/core/pull/9725/changes#r3713514183, this comment applies to all toV2 functions

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There are 2 total unresolved issues (including 1 from previous review).

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