feat(bridge-controller): add gasless related event properties

[rarquevaux]

Explanation

Adds two new optional properties to the QuotesReceived event:

• has_gas_included_quote: Boolean indicating if any quote has gas included
• usd_balance_source: Optional USD value of source token balance (client-provided)

No breaking changes.

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

Adds gasless-related metrics to improve QuotesReceived payloads.

• Add has_gas_included_quote to QuoteFetchData and compute it for QuotesReceived (surfaced in related events)
• Add optional usd_balance_source to QuotesReceived and getQuotesReceivedProperties (defaults to 0)
• Update metrics types.ts, tests, and snapshots; changelog noted

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