Wormhole rate limits

[Divljo31]

Adds pre-flight validation against the Wormhole Governor rate limits, so transfers that would be enqueued or rejected by the Governor surface a report before the user signs.

• WormholeGovernor client (xc-sdk) — wraps the wormholescan governor API (/governor/limit, /governor/config, /governor/enqueued_vaas); exposes per-chain rate-limit state and USD notional pricing by token origin.
• WormholeRateLimitValidation (xc-sdk) — resolves the emitter chain (source, or transact for MRL), prices the transfer, and emits reports for Wormhole_RateLimit_Lockdown, Wormhole_BigTransaction, Wormhole_RateLimit_Exceeded, and Wormhole_Governor_Unreachable.
• Wired into the xc factory's transferValidations and exposed as ctx.wormhole.governor.
• Adds an xc-transfer example (wormhole-ratelimit.ts) that dumps governor limits and per-asset governed pricing.

[changeset-bot]

🦋 Changeset detected

Latest commit: 030630f

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@galacticcouncil/xc-sdk	Minor
@galacticcouncil/xc	Minor

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